52 lines
1.6 KiB
Python
52 lines
1.6 KiB
Python
import bpy
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import math
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from mathutils import Vector, Matrix
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from bpy_extras.object_utils import world_to_camera_view
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def get_bone_head_tail_2d(posebone, scene=None, cam=None) -> tuple[Vector, Vector]:
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'''Get 2D vectors in camera view of bone head and tails
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return tuple of 2d vectors (head_2d and tail_2d)
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'''
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scene = scene or bpy.context.scene
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cam = cam or scene.camera
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arm = posebone.id_data
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# Get 3D locations of head and tail
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head_3d = arm.matrix_world @ posebone.head
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tail_3d = arm.matrix_world @ posebone.tail
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# Convert 3D locations to 2D
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head_2d = world_to_camera_view(scene, cam, head_3d)
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tail_2d = world_to_camera_view(scene, cam, tail_3d)
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ratio = scene.render.resolution_y / scene.render.resolution_x
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head_2d.y *= ratio
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tail_2d.y *= ratio
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return Vector((head_2d.x, head_2d.y)), Vector((tail_2d.x, tail_2d.y))
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def rotate_matrix_around_pivot(matrix, angle, pivot, axis):
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'''Rotate a given matrix by a CW angle around pivot on a given axis
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matrix (Matrix): the matrix to rotate
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angle (Float, Radians): the angle in radians
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pivot (Vector3): the pivot 3D coordinate
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axis (Vector3): the vector axis of rotation
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'''
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# Convert angle to radians ?
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# angle = math.radians(angle)
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# Create a rotation matrix
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rot_matrix = Matrix.Rotation(angle, 4, axis)
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# Create translation matrices
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translate_to_origin = Matrix.Translation(-pivot)
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translate_back = Matrix.Translation(pivot)
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# Combine the transformations : The order of multiplication is important
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new_matrix = translate_back @ rot_matrix @ translate_to_origin @ matrix
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return new_matrix |