Rendering学習日記

「実践CGへの誘い」p.67
Listing 4.3

#list43.py

#/* Copyrighted Pixar 1989 */

#/* From the RenderMan Companion p. 67 */

#/* Listing 4.3   Using RiTorus to create a wavelike pattern */



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())



def TorusWave(nwaves, thetamax):

    if nwaves < 1:

        print "Need a positive number of waves\n"

    

    #/* Divide the net radius 1.0 among the waves and the hemisphere */

    innerrad = 2 / (8.0*nwaves + 2)

    RiRotate(90.0, 1.0, 0.0, 0.0)

    #/* Create the downward-opening hemisphere */

    RiSphere(innerrad, -innerrad, 0.0, thetamax, RI_NULL)

    

    outerrad = 0

    for wave in range(1,nwaves+1):

        #* Each iteration creates a downward-opening half-torus

        #*  and a larger upward-opening half-torus.

        outerrad = outerrad + (innerrad * 2)

        RiTorus(outerrad, innerrad, 0.0, 180.0, thetamax, RI_NULL)

        outerrad = outerrad + (innerrad * 2)

        RiTorus(outerrad, innerrad, 180.0, 360.0, thetamax, RI_NULL)



def Go():

    TorusWave(4, 250.0)





RiBegin (RI_NULL)  #/* Start Renderer */

RiDisplay("wavemain.tif", RI_FILE, "rgb", RI_NULL)

RiFormat( 512, 372, -1.0)

RiProjection ("perspective", RI_NULL)



RiWorldBegin ()

RiLightSource("ambientlight","intensity",0.4)

RiLightSource ("distantlight", RI_NULL)

RiAttributeBegin()

RiTranslate (-0.1, 0.0, 1.1)

RiRotate (50.0, -1.0, 1.0, 0.0)

RiColor((0.42,0.97,0.45))

RiSurface ("plastic", Kd=1.0)

Go()

RiAttributeEnd()

RiWorldEnd()

RiEnd()

RiProjection ("perspective", "fov", 45)
と書き換えてみた。

Essential RenderManから、loop.cをPythonで試してみる。
Depth of field、PixelSamples、ShadingRateを調整しています。
ありがとうございます。

#/* loop.py - Create a line of Spheres */

# Essential RenderMan p.113

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())



RiBegin(RI_NULL)

RiDisplay ("loop.tif",RI_FILE, RI_RGB)

RiFormat(320, 240,1)

RiPixelSamples( 8, 8)

RiShadingRate(0.25)

RiProjection (RI_PERSPECTIVE)

RiDepthOfField(2.8,0.100,2)

RiTranslate(0,0,0.25)

RiRotate(-10,0,1,0)

RiWorldBegin()

RiLightSource("ambientlight","intensity",0.2)

RiLightSource("distantlight", "from",[-1,1,-1])

RiTranslate(0.3,0,0)

for i in range(12):

    RiSurface ("plastic")

    RiColor((1.0,0.05,0.05))

    RiSphere(0.25,-0.25,0.25,360,RI_NULL)

    RiTranslate(-0.2,0,0.5)



RiWorldEnd()

RiEnd()

RiLightSource("distantlight", "from",[-4,1,-1])
ディスタントライトの方向を変更してみた。

#RiDepthOfField(2.8,0.1,2)
とコメントアウトすると、くっきりになる。
cgkitと3Delightを使用しました。

Essential RenderManから、point.cをPythonで試してみる。
パーティクルも面白くなりそうです。
記述に関しては、cgkitのritest.pyが参考になります。
ありがとうございます。レンダリングは3Delightです。
以前書いた記事、CAPIでパーティクル

#point.py - Create a simple Particle System

import random, math

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())





COUNT = 1000



def jitter(scale):

    val=random.random()*1000

    return (val/500-1)*scale



position=[]

red=[1,0,0]

fov=30



#/*Generate Particle Postions*/

for i in range(COUNT):

    x=math.sin(i*0.5)*50+jitter(2)

    y=math.cos(i*0.1)*50+jitter(2)

    z=math.cos(i*0.5)*100+jitter(2)

    position.append(vec3(x, y, z))





RiBegin(RI_NULL)

RiDisplay ("point.tif","file","rgb",RI_NULL)

RiFormat(512, 384, -1.0)

RiPixelSamples( 4, 4)

RiShadingRate(0.5)

RiProjection ("perspective","fov",fov,RI_NULL)

RiWorldBegin()

RiTranslate(0,0,300)

RiColor(red)

RiPoints("P",position,RI_NULL)

RiWorldEnd()

RiEnd()