Rendering学習日記

Essential RenderManのサンプルを参照して、Python cgkitで試してみました。RiCurvesの表記の仕方がわからなくて、最初エラーが出てしまいました。
RiCurves("linear",COUNT,"nonperiodic","P",points,"constantwidth",curveWidth
RI_NULL)
・・・
TypeError: 'int' object is not iterable

原因はCOUNTはいらないということでしょうか。スクリプト書き直したら、できました。ありがとうございます。

#/* curves2.py - create a set of curves */

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



points=[]

pappend=points.append

nverts=[]

red=(1,0,0)

curveWidth=0.3

fov=30



#/*Generate Curve Postions*/

for i in range(COUNT):

    tx=(math.sin(i*0.3)*i*50)/COUNT+jitter(5)

    ty=(math.cos(i*0.3)*i*50)/COUNT+jitter(5)

    

    pappend(0)

    pappend(0)

    pappend(50)

    

    pappend(0.1*tx)

    pappend(0.1*ty)

    pappend(25)

    

    pappend(0.4*tx)

    pappend(0.4*ty)

    pappend(0)

    

    pappend(tx)

    pappend(ty)

    pappend(-25)

    

    nverts.append(4)

    



RiBegin(RI_NULL)

RiDisplay ("curves2.tiff","framebuffer","rgb",RI_NULL)

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

RiWorldBegin()

RiTranslate(0,0,200)

RiColor(red)

RiRotate(45,1,0,0)



RiCurves("linear",nverts,"nonperiodic","P",points,"constantwidth",curveWidth,RI_NULL)



RiWorldEnd()

RiEnd()

cubicに書き換えてみました。
RiCurves("cubic",nverts,"nonperiodic","P",points,"constantwidth",curveWidth,RI_NULL)
勉強ですね。ありがとうございます。

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.
RenderManProServer-14からついているimport prmanを利用してます。
cubeを作成しました。

#cube_pr.py

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

import getpass

import time

# import the python renderman library

import prman



def Cube(width,height,depth) :	

    w=width/2.0

    h=height/2.0

    d=depth/2.0

    ri.ArchiveRecord(ri.COMMENT, 'Cube Generated by Cube Function')

    #rear

    face=[-w,-h,d,-w,h,d,w,-h,d,w,h,d]

    ri.Patch("bilinear",{'P':face})

    #front

    face=[-w,-h,-d,-w,h,-d,w,-h,-d,w,h,-d]

    ri.Patch("bilinear",{'P':face})

    #left

    face=[-w,-h,-d,-w,h,-d,-w,-h,d,-w,h,d]

    ri.Patch("bilinear",{'P':face})

    #right

    face=[w,-h,-d,w,h,-d,w,-h,d,w,h,d]

    ri.Patch("bilinear",{'P':face})

    #bottom

    face=[w,-h,d,w,-h,-d,-w,-h,d,-w,-h,-d]

    ri.Patch("bilinear",{'P':face})

    #top

    face=[w,h,d,w,h,-d,-w,h,d,-w,h,-d]

    ri.Patch("bilinear",{'P':face})

    ri.ArchiveRecord(ri.COMMENT, '--End of Cube Function--')





ri = prman.Ri() # create an instance of the RenderMan interface

ri.Option("rib", {"string asciistyle": "indented"})



filename = "Cube.rib"

# this is the begining of the rib archive generation we can only

# make RI calls after this function else we get a core dump

ri.Begin("__render") #filename)

# ArchiveRecord is used to add elements to the rib stream in this case comments

# note the function is overloaded so we can concatinate output

ri.ArchiveRecord(ri.COMMENT, 'File ' +filename)

ri.ArchiveRecord(ri.COMMENT, "Created by " + getpass.getuser())

ri.ArchiveRecord(ri.COMMENT, "Creation Date: " +time.ctime(time.time()))



# now we add the display element using the usual elements

# FILENAME DISPLAY Type Output format

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

ri.Format(512, 384, -1.0)

ri.PixelSamples( 4, 4)

ri.ShadingRate(1)

# now set the projection to perspective

ri.Projection(ri.PERSPECTIVE,{ri.FOV:50}) 



# now we start our world

ri.WorldBegin()

ri.LightSource("distantlight", {ri.HANDLEID: "1","to":[0,0,1]})

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



ri.Surface("plastic")

ri.Translate(0,0,5)



ri.TransformBegin() 

ri.Translate(-2,0,0)

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

ri.Color([0,0,1])

Cube(1,1,1)

ri.TransformEnd()



ri.TransformBegin() 

ri.Translate( 0,0,0)

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

ri.Color([1,0,0])

Cube(1,1,1)

ri.TransformEnd()



ri.TransformBegin() 

ri.Translate(2,0,0)

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

ri.Color([0,1,0])

Cube(0.2,2,0.2);

ri.TransformEnd()



ri.WorldEnd()

ri.End()