Rendering学習日記

「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」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」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。