113 lines
4.3 KiB
Python
113 lines
4.3 KiB
Python
# MIT License
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#
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# Copyright (C) 2025 Ryan L. Guy & Dennis Fassbaender
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in all
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# copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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import ctypes
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import array
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import struct
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class TriangleMesh_t(ctypes.Structure):
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_fields_ = [("vertices", ctypes.c_void_p),
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("triangles", ctypes.c_void_p),
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("num_vertices", ctypes.c_int),
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("num_triangles", ctypes.c_int)]
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class TriangleMesh(object):
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def __init__(self):
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self.vertices = array.array('f', [])
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self.triangles = array.array('i', [])
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@classmethod
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def from_bobj(cls, bobj_data):
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int_data, bobj_data = bobj_data[:4], bobj_data[4:]
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num_vertices = struct.unpack('i', int_data)[0]
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num_floats = 3 * num_vertices
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num_bytes = 4 * num_floats
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vertex_data, bobj_data = bobj_data[:num_bytes], bobj_data[num_bytes:]
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vertices = list(struct.unpack('{0}f'.format(num_floats), vertex_data))
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int_data, bobj_data = bobj_data[:4], bobj_data[4:]
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num_triangles = struct.unpack('i', int_data)[0]
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num_ints = 3 * num_triangles
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num_bytes = 4 * num_ints
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triangle_data, bobj_data = bobj_data[:num_bytes], bobj_data[num_bytes:]
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triangles = list(struct.unpack('{0}i'.format(num_ints), triangle_data))
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self = cls()
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self.vertices = array.array('f', vertices)
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self.triangles = array.array('i', triangles)
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return self
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def to_bobj(self):
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num_vertices = len(self.vertices) // 3
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num_triangles = len(self.triangles) // 3
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datastr = struct.pack('i', num_vertices)
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datastr += self.vertices.tobytes()
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datastr += struct.pack('i', num_triangles)
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datastr += self.triangles.tobytes()
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return datastr
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def to_struct(self):
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num_vertices = len(self.vertices) // 3
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num_triangles = len(self.triangles) // 3
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vertex_data = (ctypes.c_float * len(self.vertices))()
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for i in range(len(self.vertices)):
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vertex_data[i] = self.vertices[i]
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triangle_data = (ctypes.c_int * len(self.triangles))()
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for i in range(len(self.triangles)):
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triangle_data[i] = self.triangles[i]
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struct = TriangleMesh_t()
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struct.vertices = ctypes.cast(vertex_data, ctypes.c_void_p)
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struct.triangles = ctypes.cast(triangle_data, ctypes.c_void_p)
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struct.num_vertices = num_vertices
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struct.num_triangles = num_triangles
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return struct
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def apply_transform(self, matrix_world):
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m = matrix_world
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for i in range(0, len(self.vertices), 3):
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v = [self.vertices[i + 0], self.vertices[i + 1], self.vertices[i + 2], 1]
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self.vertices[i + 0] = v[0]*m[0] + v[1]*m[1] + v[2]*m[2] + v[3]*m[3]
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self.vertices[i + 1] = v[0]*m[4] + v[1]*m[5] + v[2]*m[6] + v[3]*m[7]
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self.vertices[i + 2] = v[0]*m[8] + v[1]*m[9] + v[2]*m[10] + v[3]*m[11]
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def translate(self, tx, ty, tz):
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for i in range(0, len(self.vertices), 3):
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self.vertices[i + 0] += tx
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self.vertices[i + 1] += ty
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self.vertices[i + 2] += tz
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def scale(self, scale):
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for i in range(0, len(self.vertices), 3):
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self.vertices[i + 0] *= scale
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self.vertices[i + 1] *= scale
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self.vertices[i + 2] *= scale |