Rendering学習日記

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「実践CGへの誘い」例題をPythonで行う　その9

「実践CGへの誘い」p.61
Listing 4.1

基本プリミティブの表示をします。いろいろと工夫できますね。



#list41.py

#/* Copyrighted Pixar 1989 */

#/* From the RenderMan Companion p. 61 */

#/* Listing 4.1  Routine generating quadric surfaces shown in Figure 4.1 */

#/* 



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 Go():

    ShowQuads()



OFFSET = 1.2



def ShowQuads():

    RiRotate(-90.0, 1.0, 0.0, 0.0)

    

    RiTranslate(-OFFSET, 0.0, (OFFSET/2))

    RiSphere(0.5, -0.5, 0.5, 360.0, RI_NULL)        #/* Declare a sphere */

    

    RiTranslate(OFFSET, 0.0, 0.0)

    RiTranslate(0.0, 0.0, -0.5)

    RiCone(1.0, 0.5, 360.0, RI_NULL)                #/* Declare a cone */

    

    RiTranslate(0.0, 0.0, 0.5)

    RiTranslate(OFFSET, 0.0, 0.0)

    RiCylinder(0.5, -0.5, 0.5, 360.0, RI_NULL)      #/* Declare cylinder */

    

    RiTranslate(-(OFFSET*2), 0.0, -OFFSET)

    hyperpt1 =[ 0.4, -0.4, -0.4]

    hyperpt2 =[ 0.4,  0.4, 0.4]

    

    #/* Declare hyperboloid */

    RiHyperboloid(hyperpt1, hyperpt2, 360.0, RI_NULL)

    

    RiTranslate(OFFSET, 0.0, -0.5)

    RiParaboloid(0.5, 0.0, 0.9, 360.0, RI_NULL)     #/* Declare paraboloid */

    

    RiTranslate(OFFSET, 0.0, 0.5)

    RiTorus(.4, .15, 0.0, 360.0, 360.0, RI_NULL)    #/* Declare torus */





RiBegin (RI_NULL)  #/* Start Renderer */

RiDisplay("quadsmain.tiff", RI_FILE, "rgb", RI_NULL)

RiFormat( 512, 372, -1.0)

RiProjection (RI_PERSPECTIVE,RI_FOV,45)

RiTranslate (0.0, 0.0, 3.5)

RiWorldBegin ()

RiLightSource ("distantlight", RI_NULL)

RiAttributeBegin()



RiSurface ("plastic", Kd=1.0)

RiColor((0.97,0.64,0.39))

Go()

RiAttributeEnd()

RiWorldEnd()

RiEnd()

「実践CGへの誘い」例題をPythonで・・その10

「実践CGへの誘い」p.65
Listing 4.2



#list42.py

#/* Copyrighted Pixar 1989 */

#/* From the RenderMan Companion p. 65 */

#/* Listing 4.2   Using hyperboloids to create a surface of revolution */



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())



NPOINTS=16



points = [

[1.5000,.0000],

[1.4600,.0900],

[1.3500,.1273],

[1.2625,.1203],

[1.1750,.1047],

[1.0875,.0935],

[1.0000,.0899],

[0.9375,.0982],

[0.8625,.1236],

[0.7250,.1851],

[0.5875,.2281],

[0.4500,.2383],

[0.3375,.2255],

[0.2250,.1953],

[0.0750,.1414],

[0.0000,.1125]

]



color = (1,0.26,0.15)



def Go():

    global color

    RiColor(color)

    RiSurface ("plastic", Kd=1.0)

    RiRotate(-90.0, 1.0, 0.0, 0.0)

    SurfOR(points, NPOINTS)





#/* Listing 4.2  Using hyperboloids to create a surface of revolution */



def SurfOR(points, npoints):

    #/*   

    # * For each adjacent pair of x,y points in the outline description, 

    # *  draw a hyperboloid by sweeping the line segment defined by  

    # *  those points about the z axis. 

    # */ 

    pp1 =[ points[0][1], 0, points[0][0]]

    for pt in range(1, npoints):

        pp2 =[ points[pt][1], 0, points[pt][0]]

        RiHyperboloid(pp1, pp2, 360.0, RI_NULL)

        tmp = pp1

        pp1 = pp2

        pp2 = tmp





RiBegin (RI_NULL)  #/* Start Renderer */

RiDisplay("list42.tif", RI_FILE, "rgb", RI_NULL)

RiFormat( 512, 372, -1.0)

RiProjection (RI_PERSPECTIVE,RI_FOV,45)

RiTranslate (0.0, -0.75, 2.2)

RiWorldBegin ()

RiLightSource ("distantlight", RI_NULL)

RiAttributeBegin()



Go()

RiAttributeEnd()

RiWorldEnd()

RiEnd()

「実践CGへの誘い」例題をPythonで・・その11

「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。

Depth of field

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。

pythonでパーティクル

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()

pythonでパーティクル　その2

イギリスのbournemouth大学のサイトを参考に作成してみた。
レンダリングは3Delightです。
勉強になります。ありがとうございます。



#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("3delight")

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.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()

実は、3DelightのPointsは、法線N部分(,"N",normals)が無視されるようだ。図のようにdiskはカメラ方向を見ている。Prmanではdiskの面がいろいろ変わってくる。次の記事を参照してください。

pythonでパーティクル　その3

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。

pythonでパーティクル　その4

cgkitと3Delightでメタボールのパーティクルを設定してみた。
距離、明るさを調整した。
広がってきて面白いです。



#point2_blob.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("3delight")

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(0,2000):

    for ix in range(0,3):

        cappend(ru(0,1))

        pappend(ru(-2,2))

        nappend(ru(0,1))

    wappend(ru(0.04,0.45))

    



RiBegin(RI_NULL)

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

RiDisplay ("point2_blob.tif","framebuffer","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", "to",[1,0,1])

RiTranslate(0,0,6)

RiSurface("plastic")

RiPoints("P",points,"Cs",colour,"width",width,"uniform string type","blobby")

RiWorldEnd()

RiEnd()

pythonでパーティクル　その5

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()

pythonでパーティクル　その6

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()

<< 2/4 >>

Rendering学習日記

Menu

「実践CGへの誘い」例題をPythonで行う　その9

「実践CGへの誘い」例題をPythonで・・その10

「実践CGへの誘い」例題をPythonで・・その11

Depth of field

pythonでパーティクル

pythonでパーティクル　その2

pythonでパーティクル　その3

pythonでパーティクル　その4

pythonでパーティクル　その5

pythonでパーティクル　その6

連絡先

Rendering学習日記

Menu

「実践CGへの誘い」例題をPythonで行う その9

「実践CGへの誘い」例題をPythonで・・その10

「実践CGへの誘い」例題をPythonで・・その11

Depth of field

pythonでパーティクル

pythonでパーティクル その2

pythonでパーティクル その3

pythonでパーティクル その4

pythonでパーティクル その5

pythonでパーティクル その6

連絡先

「実践CGへの誘い」例題をPythonで行う　その9

pythonでパーティクル　その2

pythonでパーティクル　その3

pythonでパーティクル　その4

pythonでパーティクル　その5

pythonでパーティクル　その6