Rendering学習日記

• python cgkit
• 2010.11.23 Tuesday

できました。よく読まないといけません。
UnitCube()を最初に使った定義のものに戻しています。

「実践CGへの誘い」p.32
Listing 2.7

オブジェクトインスタンスを利用したサンプルです。
ありがとうございます。

#list27.py

#/* Copyrighted Pixar 1989 */

#/* From the RenderMan Companion p. 32 */

#/* Listing 27c A more efficient color cube */

#/* 

# *   ColorCube(): create a unit color cube from smaller cubes 

# *   Parameters:

# *    n: the number of minicubes on a side

# *    s: a scale factor for each minicube

# */



import cgkit.cri

from cgkit.cgtypes import *



# Load the RenderMan API.

# Replace the library name with whatever renderer you want to use.

ri = cgkit.cri.loadRI("3delight")

cgkit.cri.importRINames(ri, globals())



L= -.5      #* For x: left side     */

R=  .5      # /* For x: right side    */

D= -.5     #  /* For y: down side     */

U=  .5     #  /* For y: upper side    */

F=  .5     #  /* For z: far side      */

N= -.5     #  /* For z: near side     */



#/* UnitCube(): define a cube in the graphics environment */

def UnitCube():

    Cube=[

        [ [L,D,F],  [L,D,N],  [R,D,N],  [R,D,F] ],   #/* Bottom face  */

        [ [L,D,F],  [L,U,F],  [L,U,N],  [L,D,N] ],   #/* Left face    */

        [ [R,U,N],  [L,U,N],  [L,U,F],  [R,U,F] ],   #/* Top  face    */

        [ [R,U,N],  [R,U,F],  [R,D,F],  [R,D,N] ],   #/* Right face   */

        [ [R,D,F],  [R,U,F],  [L,U,F],  [L,D,F] ],   #/* Far face     */

        [ [L,U,N],  [R,U,N],  [R,D,N],  [L,D,N] ]    #/* Near face    */

    ];

    for i in range(6):

        RiPolygon(P=Cube[i])



def ColorCube(n, s):

    if n<=0:

        return

    

    cube = RiObjectBegin()

    UnitCube()

    RiObjectEnd()

    

    RiAttributeBegin()

    RiTranslate(-.5, -.5, -.5 )

    RiScale(1.0/n, 1.0/n, 1.0/n)

    color=[0,0,0]

    for x in range(n):

        for y in range(n):

            for z in range(n):

                color[0] = (x+1)/float(n)

                color[1] = (y+1)/float(n)

                color[2] = (z+1)/float(n)

                RiColor(color)

                RiTransformBegin()

                RiTranslate (x+.5, y+.5, z+.5)

                RiScale(s, s, s)

                RiObjectInstance(cube)

                RiTransformEnd()

    

    RiAttributeEnd()





color = ( .2, .4, .6 )



RiBegin(RI_NULL);      #/* Start the renderer */

RiDisplay("colormain2.tiff", RI_FILE, "rgb", RI_NULL)

RiFormat(512, 384, -1.0)

RiShadingRate(1.0)

RiLightSource("distantlight", RI_NULL)

RiProjection(RI_PERSPECTIVE,RI_FOV,65)

RiWorldBegin()

RiSides(1)   # /* N E W */

RiTranslate(0.0, 0.0, 1.5)

RiRotate(30.0, -1.0, 0.0, 0.0)

RiRotate(30.0, 0.0, -1.0, 0.0)

RiColor(color)     # /* Declare the color */

ColorCube(4, .8)   #/* Define the cube */

RiWorldEnd()

RiEnd()            #/* Clean up after the renderer */

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