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Houdiniで自分好みの階層的にFBXを書き出す為の行列処理の検証Pythonコード
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| import hou | |
| def matrixTest(): | |
| parent_node = hou.node('/obj/grid') | |
| parent_name = parent_node.name() | |
| print(parent_name) | |
| print(parent_name + " local transform") | |
| local_transform = parent_node.localTransform() | |
| print(local_transform) | |
| print("\n") | |
| print(parent_name + " worldtransform") | |
| parent_world_transform = parent_node.worldTransform() | |
| print(parent_world_transform) | |
| print("\n") | |
| print(parent_name + " inverted local transform") | |
| parent_invert_local_transform = local_transform.inverted() | |
| print(parent_invert_local_transform) | |
| print("\n") | |
| print("") | |
| child_node = parent_node.outputs()[0] | |
| child_name = child_node.name() | |
| print(child_name) | |
| print(child_name + " origin" + str(child_node.origin())) | |
| print(child_name + " parm transform") | |
| child_param_transform = child_node.parmTransform() | |
| print(child_param_transform) | |
| print("\n") | |
| print(child_name + " local transform") | |
| child_local_transform = child_node.localTransform() | |
| print(child_local_transform) | |
| print("\n") | |
| print(child_name + " world transform") | |
| child_world_transform = child_node.worldTransform() | |
| print(child_world_transform) | |
| print("\n") | |
| print(child_name + " inverted local transform") | |
| child_invert_local_transform = child_local_transform.inverted() | |
| print(child_invert_local_transform ) | |
| print("\n") | |
| print(child_name + " inverted world transform") | |
| child_invert_world_transform = child_world_transform.inverted() | |
| print(str(child_invert_world_transform)) | |
| print("\n") | |
| #ここからが検証の重要な部分 | |
| #この行列がLocalTransform適用前の行列になる | |
| #検証用でこれがrootなので更に上の親のトランスフォームに影響を受けるとこはない | |
| parent_local_invert_mul_world = parent_invert_local_transform#* grandparent_world_transform | |
| #親までのトランスフォームを相殺し、任意のローカルトランスフォームをする | |
| #親のスケールに合わせてTranslateを拡縮 | |
| translate_scaling = parent_local_invert_mul_world.extractScales("srt") | |
| t = [0,1,0] | |
| r = [0,0,45] | |
| s = [2,2,2] | |
| t[0] /= translate_scaling[0] | |
| t[1] /= translate_scaling[1] | |
| t[2] /= translate_scaling[2] | |
| local_trans = hou.hmath.buildRotate(r[0],r[1],r[2], "xyz") | |
| local_trans *= hou.hmath.buildScale(s[0],s[1],s[2]) | |
| local_trans *= hou.hmath.buildTranslate(t[0],t[1],t[2]) | |
| parent_node.setWorldTransform(local_trans * parent_local_invert_mul_world) | |
| #この行列がLocalTransform適用前の行列になる | |
| print(child_name + " inv_local * worl") | |
| child_invert_local_transform = child_node.localTransform().inverted() | |
| child_world_transform = child_node.worldTransform() | |
| child_local_invert_mul_world = child_invert_local_transform * child_world_transform | |
| print(child_local_invert_mul_world) | |
| print("This is equal parent's world transform") | |
| print("\n") | |
| #親までのトランスフォームを相殺し、任意のローカルトランスフォームをする | |
| #親のスケールに合わせてTranslateを拡縮 | |
| translate_scaling = child_local_invert_mul_world.extractScales("srt") | |
| t = [0,1,0] | |
| r = [0,0,0] | |
| s = [1,1,1] | |
| t[0] /= translate_scaling[0] | |
| t[1] /= translate_scaling[1] | |
| t[2] /= translate_scaling[2] | |
| local_trans = hou.hmath.buildRotate(r[0],r[1],r[2], "xyz") | |
| local_trans *= hou.hmath.buildScale(s[0],s[1],s[2]) | |
| local_trans *= hou.hmath.buildTranslate(t[0],t[1],t[2]) | |
| child_node.setWorldTransform(local_trans * child_local_invert_mul_world) | |
| #メッシュの位置を戻すTransform SOPを追加してもとの形状に戻し整合性を保つ | |
| render_node = parent_node.renderNode() | |
| trans_node = parent_node.createNode('xform') | |
| trans_node.setInput(0, render_node) | |
| trans_node.moveToGoodPosition() | |
| trans_node.setDisplayFlag(True) | |
| trans_node.setRenderFlag(True) | |
| #trans_node.setSelected(True, clear_all_selected=True) | |
| invert_trans = parent_node.worldTransform().inverted() | |
| s = invert_trans.extractScales("srt") | |
| r = invert_trans.extractRotates("srt", "xyz") | |
| t = invert_trans.extractTranslates("srt") | |
| trans_dic = {"tx":t[0], "ty":t[1], "tz":t[2], "rx":r[0], "ry":r[1], "rz":r[2], "sx":s[0], "sy":s[1], "sz":s[2]} | |
| trans_node.setParms(trans_dic) | |
| #メッシュの位置を戻すTransform SOPを追加してもとの形状に戻し整合性を保つ | |
| render_node = child_node.renderNode() | |
| trans_node = child_node.createNode('xform') | |
| trans_node.setInput(0, render_node) | |
| trans_node.moveToGoodPosition() | |
| trans_node.setDisplayFlag(True) | |
| trans_node.setRenderFlag(True) | |
| #trans_node.setSelected(True, clear_all_selected=True) | |
| invert_trans = child_node.worldTransform().inverted() | |
| s = invert_trans.extractScales("srt") | |
| r = invert_trans.extractRotates("srt", "xyz") | |
| t = invert_trans.extractTranslates("srt") | |
| trans_dic = {"tx":t[0], "ty":t[1], "tz":t[2], "rx":r[0], "ry":r[1], "rz":r[2], "sx":s[0], "sy":s[1], "sz":s[2]} | |
| trans_node.setParms(trans_dic) | |
| print("fin.") |
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