JPH07129796A - Reality generation device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an ambience generation device capable of interactively generating an ambience while rapidly generating light reflections and shadows for giving an ambience. A means for inputting three-dimensional image information including a three-dimensional model, arrangement information of the model in an environment space, and attributes relating to characteristics of the light source of the model, a means 2 for storing this information, a position of the light source, and Means 3 for designating light source information including attributes relating to the irradiation characteristics of the light source;
Based on the means 4 for designating parameters for controlling the shape and color of the polygon group expressing the influence of the light source on the model included in the environment space, and the three-dimensional image information, the light source information and the parameter, Means 5 for generating a polygon group and means 6 for coloring the three-dimensional model and the polygon group based on the three-dimensional image information, light source information and parameters.
And means 7 for graphically displaying the colored three-dimensional model and the polygon group.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a realistic sensation generating apparatus for expressing a realistic sensation of light in an environment in an image generated using computer graphics.

[0002]

2. Description of the Related Art Conventionally, when displaying an interior space or the like by using computer graphics, it is an object to faithfully reproduce a part of a model of light reflection in a light environment such as ray tracing and radiosity method. By using this method, phenomena such as glare and shadows have been reproduced quite accurately, and images with a realistic sensation have been realized.

In ray tracing, a point and a light source are connected by a path based on perfect specular reflection calculation, and it is checked whether or not there is an object in the path, and if not, the point is filled with the color of the light source. It is a technique. With this method, it is possible to perform reflection, shadowing, etc., but it is necessary to investigate all the paths to the light source for all the points to be filled, which has the drawback of slowing down the calculation time. In addition, since this method assumes perfect mirror surface, soft shadows cannot be generated and it is difficult to obtain a realistic image.

On the other hand, in the radiosity method, an object is approximated by a small polygon using a perfect diffused light source as a model, and polygons other than the light source also absorb and reflect light, and the energy of light between these polygons is exchanged. This is a method of calculating the equilibrium state. With this method, it is possible to generate a soft shadow or an effect of illumination due to indirect light or a surface light source, and it is possible to obtain a realistic image. However, there is a drawback in that it takes time to generate a balanced image.

Therefore, a gradual radiosity method has been developed which gradually calculates the equilibrium state. Although this method does not improve the final image generation time,
An image close to the final image can be obtained in a relatively short time. However, the problem is that shadows cannot be cast in real time.

On the other hand, as a high-speed shadowing method, there is a method called fake shadow for obtaining a projected image on a limited object such as a plane. However, soft shadowing cannot be done.

Further, in the conventional shadowing method and light environment display method, a model of light reflection is premised.
However, since the perfect modeling is not possible, the generated display is incomplete.

[0008]

As described above, the conventional shadowing method and light environment display method have a drawback in that calculation time is required. In addition, the imperfections of the model were interactively compensated, and the shadowing etc. could not be adjusted depending on the experience of the user.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to generate a reflection of light or a shadow for producing a realistic sensation at a high speed, and to enable an interactive sensation to be generated. An object is to provide a feeling generation device.

[0010]

SUMMARY OF THE INVENTION A realistic sensation generating apparatus according to the present invention is a three-dimensional image information including a three-dimensional model, arrangement information of the three-dimensional model in an environmental space, and attributes relating to characteristics of the three-dimensional model with respect to a light source. Input means for inputting, the storage means for storing the three-dimensional image information input from the input means, and the light source information for specifying the position of the light source in the environment space and the attribute regarding the irradiation characteristics of the light source. Light source information designating means, parameter designating means for designating parameters for controlling the shape and color of the polygon group expressing the influence of the light source on the three-dimensional model included in the environment space, and the three-dimensional image Polygon group generation means for generating the polygon group based on information, the light source information and the parameter, the three-dimensional image information, the light A drawing generation means for coloring the three-dimensional model and the polygon group based on the information and the parameter; and a display means for graphically displaying the colored three-dimensional model and the polygon group. To do. The presence generating device may further include a viewpoint designating unit for designating position information of a viewpoint for observing the influence.

[0011]

In the present invention, the operator is provided with the parameter designating means for designating the parameter for controlling the shape and color of the polygon group, and based on the parameter, the polygon group generating means causes the polygon group A group is generated, and the drawing generation means colors the generated polygon group. The operator
By appropriately modifying the parameters, the shape and color of the polygon group are modified to reflect the light source against the three-dimensional model, and to give a desired realism to the image expressing the influence of the light source such as reflection and shadow of the light source. Can be given.

As described above, according to the present invention, in a three-dimensional environment space such as an indoor space created by computer graphics or the like, the placement of a three-dimensional model is interactively determined, and the environment of the space is evaluated and verified. In such a system, it is possible to provide users with realistic image information,
Moreover, depending on the sensibility and experience of the user,
You can change it on the spot.

[0013]

Embodiments will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a realistic sensation generating apparatus according to a first embodiment of the present invention. This realistic sensation generating device generates a realistic sensation of a light environment in a three-dimensional spatial image of a room or the like by simulating a light reflection phenomenon. FIG. 2 illustrates the reflection of this light. The light from the light source L is reflected on the reflection surface A, and the reflection surface B is reflected.
The part illuminated by the polygonal group 31 is represented.

In FIG. 1, an input unit 1 is an input driver for fetching a three-dimensional model created by CAD or the like via a network or a storage medium such as a cartridge MT, and the arrangement and attributes of the three-dimensional model. It includes a pointing device such as a mouse for inputting, a data glove, a three-dimensional pointing device including a three-dimensional magnetic sensor, and a keyboard. Here, the attributes of the three-dimensional model are material parameters (eg, light reflectance) that characterize materials such as “metal”, “wood”, and “plastic”.

In FIG. 2, surfaces A and B are surfaces input by the three-dimensional model input unit 1, respectively. Here, as an example of the surface A and the surface B, the surface of a desk and the display screen of a desktop computer are respectively raised.

The storage unit 2 stores the three-dimensional model input by the input unit 1 and information such as its attributes and arrangement in the environment space. The light source information designating unit 3 is for designating the position of the light source in the environment space and the light source characteristics such as the direction, color, and intensity of the light beam, and the position and the light source characteristic are coordinate data and numerical values from a data file or the like. The data may be read as data, may be directly input by a user from a keyboard, or may be designated by a three-dimensional pointing device including a three-dimensional magnetic sensor or a pointing device such as a mouse.
Note that the position and the light source characteristic may use the same input method or different input methods.

It is also conceivable to display the screen as shown in FIG. 3 on a display device such as a display and specify the light source characteristics by pointing with a pointing device such as a mouse or moving a slider 29.

Here, in FIG. 2, the light source is a white point light source L, and the light intensity is 1.0 at maximum. The light emitted from the light source L is reflected by the surface A and reflected by the surface B. The parameter specifying unit 4 includes a polygon group generating unit 5 described later.
The shape of the basic polygon generated by, the size of the extended polygon,
Then, it is for designating each parameter value such as density given to each vertex. These parameter values are necessary for polygon group generation (here, reflection generation) to create a realistic sensation, and are they specified as numerical data from a data file, etc., or by the user's dial or keyboard input. , It is automatically determined by some calculation (for reflection, reflection calculation, etc.).

As a parameter value designating means, the screen as shown in FIG. 4 or FIG. 5 is displayed on a display device such as a display and designated by pointing with a pointing device such as a mouse or by moving a slider 29. Conceivable.

In the case of the designating means shown in FIG. 4, the value of each parameter is directly designated. On the other hand, in the case of the designation means shown in FIG. 5, the designation is made by using sensitivity words such as “light”, “dark”, “blurred” and “clear”. In this case, for example, the axes of “light” and “dark” (“light” is 0.
0, "dark" is set to 1.0) and each parameter is associated with an appropriate calculation formula or the like.

It is also possible to automatically determine each parameter value from attribute data such as material parameters in the three-dimensional model input by the three-dimensional model input unit 1. Also in this case, the material parameters and the respective parameters are associated with each other by an appropriate calculation formula or the like.

The polygon group generation unit 5 includes a parameter designation unit 4
A polygon group for simulating light reflection is generated based on the parameter value designated in step S1, the information about the three-dimensional model stored in the three-dimensional storage unit 2, and the light source information designated by the light source information designation unit 3. .

FIG. 6 shows an example of polygon group generation processing in the polygon group generation unit 5, which is a basic polygon generation processing (step 1), an extended polygon generation processing (step 2), and Consistency determination processing (step 3).
That is, in this embodiment, the polygon group for displaying the reflection is composed of a basic polygon and a plurality of extended polygons that extend the basic polygon. This polygon group generation processing is intended to generate a blurry feeling as a whole polygon group.

First, a basic polygon is generated in the basic polygon generating process. The basic polygon is a triangle,
Rectangle, parallelogram and pentagon can be considered. In the reflection generation in FIG. 2, the shape of the basic polygon is automatically determined by light reflection calculation.

FIG. 7 shows an example of the basic polygon generation processing in the light reflection simulation, which includes reflection calculation processing (step 11) and intersection calculation processing (step 12).

First, in the reflection calculation processing, for example, as shown in FIG. 2, reflection vectors rv0, rv1 and rv2 are calculated from the incident vectors of the light rays reaching the respective vertices of the surface A from the light source L.
, Rv3 are calculated by specular reflection calculation. In this embodiment, the arrow indicating the vector shown in FIG. 2 is omitted and is described as rv0 or the like.

Next, in the intersection calculation processing, the respective intersections of the reflected light ray calculated in the reflection calculation processing and the surface B affected by the reflection are obtained. As a result, a quadrangle having the intersections as vertices P0, P1, P2, and P3 is obtained, and this is used as a basic polygon for reflection.

FIG. 8 shows an example of the generated basic polygon 32. The basic polygon 32 has vertices P0, P1, P2, P3
The unit data n01, n12, n23, n30 in each side direction and the unit vectors n02, n13 in the diagonal direction are determined from these coordinate data. In the present embodiment, the arrow indicating the vector shown in FIG. 8 is omitted and is described as n01 or the like.

Next, in the extended polygon generation processing, some extended polygons for expanding the basic polygon 32 generated by the basic polygon generation processing are generated. FIG. 9 shows an example of a polygon group when an extended polygon is generated for the basic polygon shown in FIG.

The expanded polygon of FIG. 9 is composed of expanded quadrangles A, B, C and D for each side of the basic polygon, and eight expanded triangles T filling the spaces between these expanded quadrangles.

Assuming that the parameter indicating the size of expansion specified by the parameter specifying unit 4 is d, the vertex E0 of the expanded quadrangle A (consisting of vertices P0, E0, E1 and P1).
, E1 can be obtained from the following equation.

E 0 = P 0 + d × n 30 (1) E 1 = P 1 −d × n 12 (2) Other extended quadrangles (B, C, D) can be obtained by the same calculation.

Next, the extended triangle T that fills the space between the extended quadrilaterals (A, B, C, D) is generated. For example, two sets of extended triangles (triangles P1, E1, E8 and triangles P1, E8, E2) filling the space between the extended rectangles A and B in FIG.
Is determined by finding a vertex E8 common to these triangles from the following equation.

E8 = P1-d * n13
(3) Similar calculations are performed for other extended triangles. The value of the parameter d indicating the size of the expansion may be determined by the user in the parameter designation unit 4, or as shown in FIG. 10, the basic polygon generation processing (step 1) and the expanded polygon generation processing (step 2) may be performed. It is also conceivable to provide an extended parameter determination process (step 21) in between to calculate d depending on the shape of the basic polygon. For example, if the basic polygon is a rectangle, assuming that the length of the diagonal is l, the extension parameter d is determined by the following formula in a form dependent on l.

D = C × l (C = constant)
(4) At this time, the constant C can be designated by the parameter designating unit 4. It is also possible to define the above two sets of extended triangles as one polygon as an extended polygon. For example, as shown in FIG. 11 (a), the triangles P1, E1, E8 and the triangles P1, E8, E2 are combined into a single P1, E1, E8.
Alternatively, the expanded quadrangle 33 having the vertices at E2 and E2 may be used, or as shown in FIG.
It is also conceivable to define it as an expanded hexagon 34 having P2 and P2 as vertices. It is also possible to increase the number of extension triangles T as shown in FIG. 12 in order to interpolate smoothly between the extension quadrangle S.

Next, in the color / density determination process (step 3), the vertices (P0 to P3) of each polygon generated in the basic polygon generation process (step 1) and the extended polygon generation process (step 2). , E0 to E11) to give color and density.

Here, the density is, for example, in FIG.
It is the ratio of mixing the color of the surface B (background color) and the color of the polygon group. If the color of the light source designated by the light source information designation unit 3 is white, white (R, G, B) = (255, 255, 255) for the vertices P0 to P3 and E0 to E11 in FIG.
Is given, and the density of the vertices of the basic polygon designated by the parameter designating unit 4 is 1.0 and the density of the expanded vertices (vertices outside the polygon group) is 0.0, vertices P0 to P3 For alpha value (blending ratio) α = 255, vertex E
Α = 0 is given for 0 to E11.

Although the density parameter may be designated by the parameter value designating unit 4 as described above, it may be calculated by the following formula. That is, in the reflection display, the intensity of light that reaches the density at the apex of the polygon group is shown. It can be considered that the intensity of the reaching light depends on the intensity of the light source, the attenuation due to the distance of the light transmission path, and the absorption by the reflecting surface. Here, the light source intensity I0 is 1.0, and the light intensity I is 0.0
This is associated with the density ρ at the apex, assuming that it has a value in the range of ˜1.0. For example, in FIG. 2, the density ρ (= 0.0 to 1.0) of the vertex P0 of the basic polygon, that is, the light intensity I reaching the vertex P0 is calculated from the following equation.

Ρ = I = D × β × I0 / (L × L) (D = constant, L = L1 + L2) (5) where β is the reflectance of the surface A stored in the storage unit 2. . The vertices P1 to P3 are similarly calculated.

FIG. 13 shows an example of polygon group generation processing when the parameter designated by the parameter designating section 4 is a sensitivity word. The sensitivity / parameter conversion process (step 13) is provided before the basic polygon generation process (step 1) in the polygon group generation process of FIG. 6 described above, and the value of each parameter for the sensitivity word is calculated by this process. Determined by

In this conversion processing (step 13), for example, the values of the density parameters given to the vertices of the basic polygon are linearly changed with respect to the sensitivity word axes of "light" and "dark". Further, the extension parameter for generating the extended polygon is linearly changed with respect to the sensitivity word axes of "clear" and "blurred". In addition, a complicated sensitivity word such as “thin” is associated by combining a plurality of parameter values.

FIG. 14 shows an example of polygon group generation processing when the attributes (reflection characteristics, etc.) of the three-dimensional model stored in the three-dimensional storage unit 2 are reflected in the polygon group. The attribute / parameter conversion processing (step 14) is performed before the basic polygon generation processing (step 1) in the polygon group generation processing of FIG. 6 described above, and in this conversion processing, the value of each parameter for the attribute of the three-dimensional model. Is determined by a calculation formula or the like.

For example, a parameter d representing the size of expansion
In addition, it is possible to reflect the effects of the material of the surface that causes reflection and the material of the reflection surface that causes reflection. In FIG. 2, if the surface B or the surface A is a material that easily diffuses light, the value of d is increased. In the attribute / parameter conversion processing, for example, C in Expression (4) and material data (reflectance, etc.)
Correspond to.

Further, in FIG. 2, when the expanded polygon is generated from the vertex P0, it may be considered that d is calculated so as to depend on the distance L2 to give a sense of distance. That is, when the distance from the reflecting surface A is short, not only the intensity of the light reaching the surface B becomes stronger, but also the area where the light diffuses becomes narrower, which is reflected in the size of the expanded polygon.

FIG. 15 is a diagram showing this case. The parameter di that determines the size of each expanded polygon T expanded from each vertex of the basic polygon 32 is calculated from the distance between each vertex and the vertex of the reflecting surface A. For example, a relational expression is prepared such that di becomes smaller when the distance is smaller.

In FIG. 1, the drawing generation unit 6 linearly interpolates the polygon group generated by the polygon group generation unit 5 based on the color and density given to each vertex, for example, the color and density between the vertices. The three-dimensional model stored in the storage unit 2 is shaded according to the stored data to generate an image.

As a result, an image as shown in FIG. 2 is generated,
In the area where the surface B is the background surface and the polygon groups are overlapped, the color of the background surface B and the color of the polygon group are mixed in the area of the polygon group to generate the blurring effect.

In FIG. 1, reference numeral 7 denotes a display unit, which is a display device such as a CRT for displaying the image generated by the drawing generation unit. As shown in FIG. 16, by generating a plurality of polygon groups and displaying them in a superimposed manner on the background surface, it is possible to express a more complex blurring effect and increase the presence. is there.

Further, as shown in FIG. 17, when not only the effect of reflection by the surface A but also the light directly reaching the surface B from the light source is taken into consideration, a realistic image can be generated.
An example of calculating and displaying the light that directly reaches the surface B is shown in FIG. In this case, split surface B into several patches 40,
The distance from the light source is calculated for each vertex of the patch 40, and the light intensity is calculated in a form inversely proportional to the square of the distance as shown in Expression (5). Shading.

As described above, in this embodiment, the operator is provided with the parameter designating means for designating the parameter for controlling the shape and color of the polygonal group expressing the reflection of the light source with respect to the three-dimensional model, and the parameter is designated as the parameter. On the basis of this, the polygon group generation means generates the polygon group, and the drawing generation means is configured to color the generated polygon group, so that the operator can modify the parameters as appropriate. It is possible to give a desired realistic sensation to the image expressing the reflection of the light source.

Next, a realistic sensation generating apparatus according to the second embodiment of the present invention will be described. The realistic sensation generating apparatus according to the present exemplary embodiment generates a realistic sensation of a light environment in a three-dimensional space such as a room by simulating the reflection of the surface light source on the object surface.

The glare is "clear" or "blurred" depending on the material of the surface on which the glare is reflected. This indicates the degree of light diffusion on the surface and is due to the microscopic nature of the material. In the reflection simulation here, these material feelings are realistically generated by the polygon group and its parameters.

FIG. 19 is a schematic block diagram of the realistic sensation generating apparatus of this embodiment. The difference from the schematic configuration diagram in the case of the flashback simulation in FIG. 1 is that a viewpoint designating unit 8 for designating position information of the viewpoint is provided.

FIG. 20 is a diagram showing the reflection, and planes A and B in the figure are the three-dimensional model stored in the storage unit 2 of FIG. 19, and the viewpoint E is designated by the viewpoint designating unit 3. It is the position of the viewpoint. The surface A is a surface light source.

In the case of the reflection simulation, the basic polygon is generated by using the mirror image method. For example, in FIG. 20, first, a target point E ′ for the plane B of the viewpoint E is calculated,
A straight line formed by connecting the target point E ′ and each of the vertices of the surface light source A is obtained. Further, an intersection of the straight line and the surface B is obtained, and a quadrangle having the intersection as the apex is generated. Let the basic polygon 41.

The generation of the extended polygon and the determination of the color and the density may be performed in the same manner as in the case of the above-mentioned reflection simulation. As described above, in the present embodiment, the operator is provided with the parameter designating means for designating the parameter for controlling the shape and color of the polygon group expressing the reflection of the light source on the three-dimensional model, and based on the parameter. Since the polygon group generating means generates the polygon group and the drawing generating means colors the generated polygon group, the operator appropriately modifies the parameters to set the light source. It is possible to give a desired realistic sensation to the image expressing the reflection of the image.

Next, a realistic sensation generating apparatus according to the third embodiment of the present invention will be described. The realistic sensation generation apparatus according to the present embodiment simulates the shadow of an object to generate 3
This is to generate a realistic sensation of the light environment in the dimensional space.

When the light source is a surface light source, the shadow of the object is composed of a main shadow and a penumbra, and the penumbra formed around the main shadow produces the "softness" of the shadow as a whole. The shadowing simulation here is based on the polygon group and its parameters.
The penumbra effect of a surface light source is generated with a realistic feeling.

The schematic configuration diagram of the realistic sensation generating apparatus of this embodiment is similar to that of FIG. However, the generation process of the basic polygon that simulates the shadow and the color given to each vertex of the polygon group are different. FIG. 21 is a diagram showing shading. Surfaces A and B in the figure are the three-dimensional model stored in the three-dimensional storage unit 2 of FIG. 1, and the light source L is the point designated by the light source information designation unit. It is a light source.

For example, as shown in FIG. 21, the basic polygon 32 in the shadowing simulation is generated by projecting the surface A onto the surface B with the light rays emitted from the point light source L. That is, the intersection point of the surface B and the straight line connecting the vertices of the light source L and the surface A is obtained, and a quadrangle having the intersection point as the apex is generated and used as the basic polygon of the shadow.

Generation of the extended polygons S and T and determination of color and density may be performed in the same manner as in the case of reflection, but since the polygon group shows a shadow, the color given to the apex is black. In the polygon group generation, it is possible to give a sense of distance between an object that casts a shadow and an object that casts a shadow. FIG. 22 illustrates a case where the sense of distance is represented by the polygon group 31. That is, when the extended polygons S and T are generated, the basic polygon 3
An extension parameter di corresponding to the distance of a line connecting each vertex of 2 and the vertex of the surface A (for example, proportional to the distance) is used. It is also possible to give a sense of distance by the density of the shadows given. That is, similarly to the determination of di described above, the density corresponding to the distance of the line connecting each vertex of the basic polygon 32 and the surface A (for example, inversely proportional to the square of the distance) is given.

Finally, a case where a polygon group is clipped by a three-dimensional model (plane) in space will be described by taking shadowing as an example. FIG. 23 illustrates how the shadow of the surface A is clipped by the surface B.

In this case, in order to generate the final polygon group 31, a basic polygon 32 is generated as shown in FIG. 24 (step 1) and extended polygons S and T are generated (step 2). Then, for each of these generated polygons, face B
Clipping processing is performed (step 30). The clipping process is performed by, for example, obtaining the intersection of the side of each polygon and the side of the surface B.

FIG. 25 shows how the shadow of the surface A is clipped by the surfaces B and C. In this case, for each of the faces B and C, the basic polygon 3
2,32 'and extended polygons S, T, S', T'are generated,
The polygon group 31 generated for the surface B is subjected to clipping processing on the surface B, and the polygon group 3 generated for the surface C 3
1'performs clipping processing on the surface C.

Then, the color and density are determined (step 3). As described above, in this embodiment, the operator is provided with the parameter designating means for designating the parameter for controlling the shape and color of the polygon group expressing the shadow for the three-dimensional model, and based on the parameter, the parameter designating means is provided. The polygon group generating means generates the polygon group, and the drawing generating means is configured to color the generated polygon group. Therefore, the operator appropriately expresses the shadow by expressing the shadow. It is possible to give the image a desired realism. It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be carried out without departing from the scope of the invention.

[0066]

According to the present invention, the placement of a three-dimensional model can be interactively determined in a three-dimensional environment space such as an indoor space created by computer graphics.
In a system that evaluates and verifies the environment of space,
It is possible to provide the user with realistic image information, and it is possible to change this presence on the spot according to the user's sensitivity and experience.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a realistic sensation generation device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a glare phenomenon.

FIG. 3 is a diagram illustrating a light source information specifying method.

FIG. 4 is a diagram for explaining designation of polygon group parameters.

FIG. 5 is a diagram for explaining designation by sensitivity words.

FIG. 6 is a flowchart showing the flow of processing in the polygon generator.

FIG. 7 is a flowchart showing an example of basic polygon generation processing.

FIG. 8 is a diagram illustrating a basic polygon.

FIG. 9 is a diagram illustrating a polygon group.

FIG. 10 is a flowchart showing a flow of processing of a polygon generation unit.

FIG. 11 is a diagram showing another example of the extended polygon.

FIG. 12 is a diagram showing a further example of an extended polygon.

FIG. 13 is a flowchart showing a flow in the polygon generation unit.

FIG. 14 is a flowchart showing a flow in a polygon generator.

FIG. 15 is a diagram for explaining a sense of distance of glare.

FIG. 16 is a diagram showing a state in which a plurality of polygon groups are displayed.

FIG. 17 is a diagram for explaining the influence of direct light.

FIG. 18 is a diagram illustrating a method of displaying the influence of direct light.

FIG. 19 is a schematic configuration diagram showing a realistic sensation generation device according to a second embodiment of the present invention.

FIG. 20 is a diagram illustrating a reflection phenomenon.

FIG. 21 is a diagram illustrating shadowing.

FIG. 22 is a diagram illustrating a sense of distance due to shadowing.

FIG. 23 is a diagram for explaining shadow clipping processing.

FIG. 24 is a flowchart showing a flow in the polygon generation unit.

FIG. 25 is a diagram showing a state in which a shadow is clipped.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Input part, 2 ... Storage part, 3 ... Light source information specification part, 4 ... Parameter specification part, 5 ... Polygon group generation part, 6 ... Drawing generation part, 7 ... Display part, 31 ... Polygon group 31, 32 … Basic polygon, S… Expanded quadrangle, T… Expanded triangle

Claims (1)

[Claims] 1. An input unit for inputting three-dimensional image information including a three-dimensional model, arrangement information of the three-dimensional model in an environment space, and attributes relating to characteristics of the three-dimensional model with respect to a light source, and input from the input unit. Storage means for storing the three-dimensional image information; light source information designating means for designating light source information including attributes relating to the position of the light source in the environment space and the irradiation characteristics of the light source; and the light source providing to the environment space. Parameter designating means for designating a parameter for controlling the shape and color of a polygon group expressing an influence, and a polygon for generating the polygon group based on the three-dimensional image information, the light source information and the parameter. Group generation means, the three-dimensional model and the polygon based on the three-dimensional image information, the light source information and the parameters A drawing generating means for coloring the group, realism generating apparatus characterized by comprising a display means for drawing displaying the colored three-dimensional model and polygons group.