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pythonでパーティクル　その7

Essential RenderManを参考に、cgkitを利用して、Pointsのwidthを調整してみる。レンダリングは3Delightです。ありがとうございます。
width.jpg
RenderMan Procedual Primitives



#width.py - Create Particles of different sizes

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 = 2000



def jitter(scale):

    val=random.random()*1000

    return (val/500-1)*scale



position=[]

constantwidth=0.5

fov=30

red=[1,0,0]

green=[0,1,0]

width=[]

constantwidth=1.0

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)

    w=jitter(1.0)+0.5

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

    width.append(w)



RiBegin(RI_NULL)

RiDisplay ("width.tiff","file","rgb",RI_NULL)

RiFormat(512, 384, -1.0)

RiPixelSamples( 4, 4)

RiShadingRate(0.5)

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

RiWorldBegin()

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

RiLightSource("distantlight", "from",[0,0,1])

RiTranslate(0,0,250)

RiSurface("plastic")

RiColor(red)

RiPoints("P",position,"constantwidth", constantwidth,RI_NULL)

RiColor(green)

RiPoints("P",position,"width",width,RI_NULL)

RiWorldEnd()

RiEnd()

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