Rendering学習日記

cgkitとPrmanを組み合わせる。どうも3Delightとprmanでは、RiPointの仕様がちがうようです。
3Delightのマニュアルはこちらになりますが、blobbyが使えて、遊べそうです。

さてさてPrmanだと以下の通りになります。

#point2.py - Create a simple Particle System

import random, math

import cgkit.cri

from cgkit.cgtypes import *

from random import uniform as ru





# Load the RenderMan API.

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

ri = cgkit.cri.loadRI("C:\Program Files (x86)\Pixar\RenderManProServer-14.4\lib\libprman")

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



points=[]

width=[]

colour=[]

normals=[]

pappend=points.append

wappend=width.append

cappend=colour.append

nappend=normals.append



for i in range(0,1500):

    for ix in range(0,3):

        cappend(ru(0,1))

        pappend(ru(-2,2))

        nappend(ru(0,1))

    wappend(ru(0.01,0.2))

    



RiBegin(RI_NULL)

RiImager("background", "color background",(.2,.4,.6))

RiDisplay ("point2_pr.tif","file","rgb",RI_NULL)

RiFormat(512, 384, -1.0)

RiPixelSamples( 4, 4)

RiShadingRate(1)

RiProjection ("perspective","fov",30,RI_NULL)

RiWorldBegin()

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

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

RiTranslate(0,0,6)

RiSurface("plastic")

RiPoints("P",points,"Cs",colour,"width",width,"N",normals,RI_NULL)

RiWorldEnd()

RiEnd()

実行方法は、

>point2_pr.py |prman


ありがとうございます。調べて納得して、繰り返し繰り返しですね。

Essential RenderManを参考に、cgkitで作成した。レンダリングは3Delightです。試してみると面白いです。ありがとうございます。

#color.py - Create Particles of different colors

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=[]

color=[]

constantwidth=2.5

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)

    color0=jitter(0.5)+0.5

    color1=jitter(0.5)+0.5

    color2=jitter(0.5)+0.5

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

    color.append(vec3(color0, color1, color2))



RiBegin(RI_NULL)

RiDisplay ("color_par.tif","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")

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

RiWorldEnd()

RiEnd()

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。

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()