Rendering学習日記

• python cgkit
• 2010.11.23 Tuesday

■簡単なアニメーション
６０フレーム出力してみました。
「実践CGへの誘い」p.34
Listing 2.8を改良しました。
Python便利ですね。
ありがとうございます。

#list28change.py

#/* Copyrighted Pixar 1989 */

#/* From the RenderMan Companion p. 34 */

#/* Listing 2.8  A simple animation  */

#/* 

# *   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 )



NFRAMES = 60     #/* number of frames in the animation */

NCUBES = 5       #/* # of minicubes on a side of the color cube */

FRAMEROT = 3.0   #/* # of degrees to rotate cube between frames */





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

frame = 1

for frame in range(frame,NFRAMES+1):

    if len(str(frame))==1:

        print "anim00"+"%d.tif" % frame

        filename="anim00"+"%d.tif" % frame

    elif len(str(frame))==2:

        print "anim0"+"%d.tif" % frame

        filename="anim0"+"%d.tif" % frame

    else:

        print "anim%d.tif" % frame

        filename="anim%d.tif" % frame

    

    RiFrameBegin(frame)

    RiLightSource("distantlight", RI_NULL)

    #/* Viewing transformation */

    RiProjection("perspective", RI_NULL)

    RiTranslate(0.0, 0.0, 1.5)

    RiRotate(40.0, -1.0, 1.0, 0.0)

    

    RiDisplay(filename, RI_FILE, RI_RGBA, RI_NULL)

    RiFormat(512, 384, -1.0)

    RiShadingRate(1.0)

    RiWorldBegin()

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

    scale = (NFRAMES-(frame-1)) / float(NFRAMES)

    RiRotate(FRAMEROT*frame, 0.0, 0.0, 1.0)

    RiSurface("matte", RI_NULL)

    ColorCube(NCUBES, scale)        #/* Define the cube */

    RiWorldEnd()

    RiFrameEnd()



RiEnd()

出力画像はこちらを参考にしてください。

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