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#python
import k3d
context.document.start_change_set()
try:
# Create a FrozenMesh node to act as a mesh source ...
frozen_mesh = k3d.plugin.create("FrozenMesh", context.document)
frozen_mesh.name = "Bilinear Patch"
# Create a mesh ...
mesh = frozen_mesh.create_mesh()
# Add geometric points to the mesh ...
points = mesh.create_points()
point_selection = mesh.create_point_selection()
positions = [(-5, 0, 5), (5, 0, 5), (0, -5, -5), (0, 5, -5)]
for position in positions:
points.append(k3d.point3(position[0], position[1], position[2]))
point_selection.append(0.0)
# Create a bilinear_patch primitive ...
patches = k3d.bilinear_patch.create(mesh)
# Create a custom attribute array to store color values at each parametric corner of each patch ...
Cs = patches.parameter_attributes().create("Cs", "k3d::color")
# Add a single patch to the primitive ...
patches.patch_selections().append(0)
patches.patch_materials().append(None)
for i in range(4):
patches.patch_points().append(len(patches.patch_points()))
# Add some colors to the patch corners ...
Cs.append(k3d.color(1, 0, 0))
Cs.append(k3d.color(0, 1, 0))
Cs.append(k3d.color(0, 0, 1))
Cs.append(k3d.color(1, 1, 1))
# Connect the FrozenMesh to a MeshInstance to place it in the scene ...
mesh_instance = k3d.plugin.create("MeshInstance", context.document)
mesh_instance.name = "Bilinear Patch Instance"
mesh_instance.gl_painter = k3d.node.lookup_one(context.document, "GL Default Painter")
mesh_instance.ri_painter = k3d.node.lookup_one(context.document, "RenderMan Default Painter")
k3d.property.connect(context.document, frozen_mesh.get_property("output_mesh"), mesh_instance.get_property("input_mesh"))
# Make the MeshInstance visible to render engines ...
k3d.node.show(context.document, mesh_instance)
context.document.finish_change_set("Create Bilinear Patch")
except:
context.document.cancel_change_set()
raise
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