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import numpy as np
from mesh import Mesh
def cylinder(radius=1.0, height=1.0, theta=np.pi/32):
angles = np.arange(0, 2*np.pi, theta)
vertices = np.empty((2*len(angles) + 2, 3), dtype=np.float32)
vertices[:2*len(angles),0] = radius*np.tile(np.cos(angles),2)
vertices[:2*len(angles),1] = radius*np.tile(np.sin(angles),2)
vertices[:len(angles),2] = height/2.0
vertices[len(angles):2*len(angles),2] = -height/2.0
vertices[-2] = [0,0,height/2.0]
vertices[-1] = [0,0,-height/2.0]
triangles = np.zeros((len(angles)*4, 3), dtype=np.uint32)
# top
triangles[:len(angles),0] = np.arange(len(angles))
triangles[:len(angles),2] = np.roll(np.arange(len(angles)),1)
triangles[:len(angles),1] = len(vertices) - 2
# bottom
triangles[len(angles):2*len(angles),0] = \
np.arange(len(angles),2*len(angles))
triangles[len(angles):2*len(angles),1] = \
np.roll(np.arange(len(angles),2*len(angles)),1)
triangles[len(angles):2*len(angles),2] = len(vertices) - 1
# side
triangles[2*len(angles):3*len(angles),0] = np.arange(len(angles))
triangles[2*len(angles):3*len(angles),2] = \
np.arange(len(angles),2*len(angles))
triangles[2*len(angles):3*len(angles),1] = \
np.roll(np.arange(len(angles),2*len(angles)),1)
# side
triangles[3*len(angles):4*len(angles),0] = np.arange(len(angles))
triangles[3*len(angles):4*len(angles),2] = \
np.roll(np.arange(len(angles),2*len(angles)),1)
triangles[3*len(angles):4*len(angles),1] = \
np.roll(np.arange(len(angles)),1)
return Mesh(vertices, triangles)
if __name__ == '__main__':
from solid import Solid
from geometry import Geometry
from view import view
cylinder_mesh = cylinder()
cylinder_solid = Solid(0, cylinder_mesh)
geometry = Geometry([cylinder_solid])
geometry.build(bits=8)
view(geometry)
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