Rendering学習日記

prmanでパーティクル。cgkitは使わないです。
イギリスのbournemouth universityを参考にしました。ありがとうございます。Thank you.

#hair2.py

#set PYTHONPATH=C:\Python25;C:\Python\Scripts;%RMANTREE%\bin

import random

from random import uniform as ru

import prman

ri=prman.Ri()



points=[]

pappend=points.append

width=[]

wappend=width.append

npoints=[]

npappend=npoints.append

random.seed(129234)

ru=random.uniform

zpos=-2.0

plus=0.1

minus=-0.1

while(zpos < 2.0 ) :

    xpos=-2.0

    while (xpos < 2.0) :

        pappend(xpos+ru(minus,plus))

        pappend(0)

        pappend(zpos+ru(minus,plus))

        

        pappend(xpos+ru(minus,plus))

        pappend(0.1)

        pappend(zpos+ru(minus,plus))

        

        pappend(xpos+ru(minus,plus))

        pappend(0.2)

        pappend(zpos+ru(minus,plus))

        

        pappend(xpos+ru(minus,plus))

        pappend(0.3+ru(-0.1,0.1))

        pappend(zpos+ru(minus,plus))

        

        wappend(0.006)

        wappend(0.001)

        npappend(4)

        xpos+=0.02

    zpos+=0.02



ri.Begin(ri.RENDER)

ri.Imager("background", {"color color":(.2,.4,.6)})

ri.Display("hair_pr.png", "file", "rgb")

ri.Format(640,480,1)

ri.Projection(ri.PERSPECTIVE, {ri.FOV: 90})

ri.Translate(0,0,2)

ri.Rotate(-25,1,0,0)

ri.WorldBegin()

ri.LightSource("distantlight", {ri.HANDLEID: "1"})

ri.LightSource("ambientlight", {ri.HANDLEID: "2", "intensity":[0.4]})

ri.Color((1,0.2,0.2))

ri.Surface("hair")

ri.Curves( "cubic",npoints,"nonperiodic",{ri.P:points, ri.WIDTH : width})

ri.WorldEnd()

ri.End()

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()