Rendering学習日記

• python cgkit
• 2010.11.23 Tuesday

「実践CGへの誘い」p.30
Listing 2.6
cgkitを使ってPython APIによるRenderManeインタフェースの勉強です。今回は、色つき立方体の生成です。面白いですね。
レンダリングは、3Delightを使っています。さらに、勉強していきます。ありがとうございます。

#list26.py

#/* Copyrighted Pixar 1989 */

#/* From the RenderMan Companion p. 30 */

#/* Listing 2.6  Defining a larger cube from smaller minicubes */

#/* 

# *   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())



#/* UnitCube(): Enter a unit cube into the scene */



def ColorCube(n, s):

    if n<=0:

        return

    

    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)

                UnitCube()

                RiTransformEnd ()

    

    

    RiAttributeEnd();





def UnitCube():

    square = [ [.5,.5,.5], [-.5,.5,.5], [-.5,-.5,.5], [.5,-.5,.5] ]

    RiTransformBegin()

    #/* far square */

    RiPolygon( RI_P, square, RI_NULL)

    #/* right face */

    RiRotate(90.0, 0.0, 1.0, 0.0)

    RiPolygon( RI_P, square, RI_NULL)

    #/* near face */

    RiRotate(90.0, 0.0, 1.0, 0.0)

    RiPolygon( RI_P, square, RI_NULL)

    #/* left face */

    RiRotate(90.0, 0.0, 1.0, 0.0)

    RiPolygon( RI_P, square, RI_NULL)

    RiTransformEnd()

    

    RiTransformBegin()

    #/* bottom face */

    RiRotate(90.0, 1.0, 0.0, 0.0)

    RiPolygon( RI_P, square, RI_NULL)

    RiTransformEnd()

    

    RiTransformBegin()

    #/* top face */

    RiRotate(-90.0, 1.0, 0.0, 0.0)

    RiPolygon( RI_P, square, RI_NULL)

    RiTransformEnd()



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



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

RiDisplay("colormain.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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