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171 lines
3.2 KiB
Python
Executable file
171 lines
3.2 KiB
Python
Executable file
#! /usr/bin/env python
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# Rotate a 3D surface created using NURBS.
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#
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# Press left mouse button to toggle surface trimming.
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# Press ESC to quit.
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#
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# See the GL manual for an explanation of NURBS.
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from gl import *
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from GL import *
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from DEVICE import *
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TRUE = 1
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FALSE = 0
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ORDER = 4
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idmat = [1,0,0,0, 0,1,0,0, 0,0,1,0, 0,0,0,1]
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surfknots = [-1, -1, -1, -1, 1, 1, 1, 1]
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def make_ctlpoints():
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c = []
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#
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ci = []
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ci.append((-2.5, -3.7, 1.0))
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ci.append((-1.5, -3.7, 3.0))
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ci.append((1.5, -3.7, -2.5))
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ci.append((2.5, -3.7, -0.75))
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c.append(ci)
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#
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ci = []
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ci.append((-2.5, -2.0, 3.0))
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ci.append((-1.5, -2.0, 4.0))
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ci.append((1.5, -2.0, -3.0))
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ci.append((2.5, -2.0, 0.0))
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c.append(ci)
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#
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ci = []
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ci.append((-2.5, 2.0, 1.0))
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ci.append((-1.5, 2.0, 0.0))
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ci.append((1.5, 2.0, -1.0))
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ci.append((2.5, 2.0, 2.0))
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c.append(ci)
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#
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ci = []
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ci.append((-2.5, 2.7, 1.25))
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ci.append((-1.5, 2.7, 0.1))
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ci.append((1.5, 2.7, -0.6))
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ci.append((2.5, 2.7, 0.2))
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c.append(ci)
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#
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return c
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ctlpoints = make_ctlpoints()
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trimknots = [0., 0., 0., 1., 1., 2., 2., 3., 3., 4., 4., 4.]
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def make_trimpoints():
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c = []
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c.append((1.0, 0.0, 1.0))
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c.append((1.0, 1.0, 1.0))
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c.append((0.0, 2.0, 2.0))
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c.append((-1.0, 1.0, 1.0))
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c.append((-1.0, 0.0, 1.0))
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c.append((-1.0, -1.0, 1.0))
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c.append((0.0, -2.0, 2.0))
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c.append((1.0, -1.0, 1.0) )
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c.append((1.0, 0.0, 1.0))
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return c
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trimpoints = make_trimpoints()
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def main():
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init_windows()
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setup_queue()
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make_lights()
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init_view()
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#
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set_scene()
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setnurbsproperty( N_ERRORCHECKING, 1.0 )
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setnurbsproperty( N_PIXEL_TOLERANCE, 50.0 )
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trim_flag = 0
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draw_trim_surface(trim_flag)
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#
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while 1:
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while qtest():
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dev, val = qread()
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if dev == ESCKEY:
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return
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elif dev == WINQUIT:
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dglclose(-1) # this for DGL only
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return
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elif dev == REDRAW:
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reshapeviewport()
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set_scene()
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draw_trim_surface(trim_flag)
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elif dev == LEFTMOUSE:
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if val:
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trim_flag = (not trim_flag)
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set_scene()
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draw_trim_surface(trim_flag)
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def init_windows():
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foreground()
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#prefposition(0, 500, 0, 500)
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wid = winopen('nurbs')
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wintitle('NURBS Surface')
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doublebuffer()
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RGBmode()
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gconfig()
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lsetdepth(0x000, 0x7fffff)
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zbuffer( TRUE )
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def setup_queue():
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qdevice(ESCKEY)
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qdevice(REDRAW)
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qdevice(RIGHTMOUSE)
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qdevice(WINQUIT)
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qdevice(LEFTMOUSE) #trimming
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def init_view():
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mmode(MPROJECTION)
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ortho( -4., 4., -4., 4., -4., 4. )
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#
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mmode(MVIEWING)
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loadmatrix(idmat)
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#
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lmbind(MATERIAL, 1)
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def set_scene():
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lmbind(MATERIAL, 0)
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RGBcolor(150,150,150)
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lmbind(MATERIAL, 1)
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clear()
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zclear()
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#
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rotate( 100, 'y' )
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rotate( 100, 'z' )
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def draw_trim_surface(trim_flag):
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bgnsurface()
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nurbssurface(surfknots, surfknots, ctlpoints, ORDER, ORDER, N_XYZ)
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if trim_flag:
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bgntrim()
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nurbscurve(trimknots, trimpoints, ORDER-1, N_STW)
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endtrim()
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endsurface()
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swapbuffers()
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def make_lights():
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lmdef(DEFLMODEL,1,[])
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lmdef(DEFLIGHT,1,[])
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#
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# define material #1
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#
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a = []
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a = a + [EMISSION, 0.0, 0.0, 0.0]
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a = a + [AMBIENT, 0.1, 0.1, 0.1]
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a = a + [DIFFUSE, 0.6, 0.3, 0.3]
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a = a + [SPECULAR, 0.0, 0.6, 0.0]
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a = a + [SHININESS, 2.0]
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a = a + [LMNULL]
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lmdef(DEFMATERIAL, 1, a)
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#
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# turn on lighting
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#
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lmbind(LIGHT0, 1)
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lmbind(LMODEL, 1)
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main()
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