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「実践CGへの誘い」例題をPythonで・・その10

list42.jpg
「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()

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