|
| 1 | +bl_info = { |
| 2 | + "name": "Mesh Morpher", |
| 3 | + "author": "ibra-kdbra", |
| 4 | + "version": (1, 0), |
| 5 | + "blender": (4, 0, 1), |
| 6 | + "location": "View3D > Sidebar > Unreal Tools Tab", |
| 7 | + "description": "A tool for storing shape key data for use in a vertex shader.", |
| 8 | + "warning": "", |
| 9 | + "doc_url": "", |
| 10 | + "category": "Unreal Tools", |
| 11 | +} |
| 12 | + |
| 13 | + |
| 14 | +import bpy |
| 15 | + |
| 16 | + |
| 17 | +def pack_normals(me): |
| 18 | + """Stores normals in a given mesh's vertex colors""" |
| 19 | + if not me.vertex_colors: |
| 20 | + me.vertex_colors.new() |
| 21 | + col = me.vertex_colors[0] |
| 22 | + col.name = "normals" |
| 23 | + key = me.shape_keys.key_blocks[1] |
| 24 | + normals = list(zip(*[iter(key.normals_vertex_get())]*3)) |
| 25 | + for loop in me.loops: |
| 26 | + r, g, b = normals[loop.vertex_index] |
| 27 | + col.data[loop.index].color = ((r + 1) * 0.5, (-g + 1) * 0.5, (b + 1) * 0.5, 1) |
| 28 | + |
| 29 | + |
| 30 | +def get_shape_key_offsets(shape_keys, two_shape_keys=False): |
| 31 | + """Return a list of vertex offsets between shape keys""" |
| 32 | + keys = shape_keys.key_blocks |
| 33 | + offsets = [] |
| 34 | + original = keys[0].data |
| 35 | + target = keys[1].data |
| 36 | + offset = [v1.co - v2.co for v1, v2 in zip(target, original)] |
| 37 | + offsets.append(offset) |
| 38 | + if two_shape_keys: |
| 39 | + target = keys[2].data |
| 40 | + offset = [v1.co - v2.co for v1, v2 in zip(target, original)] |
| 41 | + offsets.append(offset) |
| 42 | + return offsets |
| 43 | + |
| 44 | + |
| 45 | +def pack_offsets(ob, offsets): |
| 46 | + """Stores shape key vertex offsets in mesh's UVs""" |
| 47 | + me = ob.data |
| 48 | + while len(me.uv_layers) < 4: |
| 49 | + me.uv_layers.new() |
| 50 | + for loop in me.loops: |
| 51 | + x1, y1, z1 = offsets[0][loop.vertex_index] |
| 52 | + if len(offsets) > 1: |
| 53 | + offset = offsets[1][loop.vertex_index] |
| 54 | + else: |
| 55 | + offset = ob.location |
| 56 | + x2, y2, z2 = offset |
| 57 | + me.uv_layers[1].data[loop.index].uv = (x2, 1 - (-y2)) |
| 58 | + me.uv_layers[2].data[loop.index].uv = (z2, 1 - x1) |
| 59 | + me.uv_layers[3].data[loop.index].uv = (-y1, 1 - z1) |
| 60 | + |
| 61 | + |
| 62 | +class MeshMorpherSettings(bpy.types.PropertyGroup): |
| 63 | + store_shape_key1_normals: bpy.props.BoolProperty( |
| 64 | + name="First Shape Key Normals", |
| 65 | + description="Store first shape key's vertex normals in vertex colors", |
| 66 | + default=True |
| 67 | + ) |
| 68 | + two_shape_keys: bpy.props.BoolProperty( |
| 69 | + name="Two Shape Keys", |
| 70 | + description="Store vertex offsets for first and second shape keys", |
| 71 | + default=False |
| 72 | + ) |
| 73 | + |
| 74 | + |
| 75 | +class OBJECT_OT_ProcessShapeKeys(bpy.types.Operator): |
| 76 | + """Store object's shape key offsets in it's UV layers""" |
| 77 | + bl_idname = "object.process_shape_keys" |
| 78 | + bl_label = "Process Shape Keys" |
| 79 | + |
| 80 | + store_shape_key1_normals: bpy.props.BoolProperty( |
| 81 | + name="First Shape Key Normals", |
| 82 | + default=True |
| 83 | + ) |
| 84 | + two_shape_keys: bpy.props.BoolProperty( |
| 85 | + name="Two Shape Keys", |
| 86 | + default=False |
| 87 | + ) |
| 88 | + |
| 89 | + @classmethod |
| 90 | + def poll(cls, context): |
| 91 | + ob = context.active_object |
| 92 | + return ob and ob.type == 'MESH' and ob.mode == 'OBJECT' |
| 93 | + |
| 94 | + |
| 95 | + def execute(self, context): |
| 96 | + units = context.scene.unit_settings |
| 97 | + ob = context.object |
| 98 | + shape_keys = ob.data.shape_keys |
| 99 | + if units.system != 'METRIC' or round(units.scale_length, 2) != 0.01: |
| 100 | + self.report( |
| 101 | + {'ERROR'}, |
| 102 | + "Scene Units must be Metric with a Unit Scale of 0.01!" |
| 103 | + ) |
| 104 | + return {'CANCELLED'} |
| 105 | + if not shape_keys: |
| 106 | + self.report({'ERROR'}, "Object has no shape keys!") |
| 107 | + return {'CANCELLED'} |
| 108 | + if len(shape_keys.key_blocks) < 2 + self.two_shape_keys: |
| 109 | + self.report({'ERROR'}, "Object needs additional shape keys!") |
| 110 | + return {'CANCELLED'} |
| 111 | + if self.store_shape_key1_normals: |
| 112 | + pack_normals(ob.data) |
| 113 | + offsets = get_shape_key_offsets(shape_keys, self.two_shape_keys) |
| 114 | + pack_offsets(ob, offsets) |
| 115 | + return {'FINISHED'} |
| 116 | + |
| 117 | + |
| 118 | +class VIEW3D_PT_MeshMorpher(bpy.types.Panel): |
| 119 | + """Creates a Panel in 3D Viewport""" |
| 120 | + bl_label = "Mesh Morpher" |
| 121 | + bl_idname = "VIEW3D_PT_mesh_morpher" |
| 122 | + bl_space_type = 'VIEW_3D' |
| 123 | + bl_region_type = 'UI' |
| 124 | + bl_category = "Unreal Tools" |
| 125 | + |
| 126 | + def draw(self, context): |
| 127 | + layout = self.layout |
| 128 | + col = layout.column() |
| 129 | + props = context.scene.mesh_morpher_settings |
| 130 | + col.prop(props, "store_shape_key1_normals") |
| 131 | + col.prop(props, "two_shape_keys") |
| 132 | + op = col.operator("object.process_shape_keys") |
| 133 | + op.store_shape_key1_normals = props.store_shape_key1_normals |
| 134 | + op.two_shape_keys = props.two_shape_keys |
| 135 | + |
| 136 | + |
| 137 | +def register(): |
| 138 | + bpy.utils.register_class(MeshMorpherSettings) |
| 139 | + bpy.utils.register_class(OBJECT_OT_ProcessShapeKeys) |
| 140 | + bpy.utils.register_class(VIEW3D_PT_MeshMorpher) |
| 141 | + bpy.types.Scene.mesh_morpher_settings = bpy.props.PointerProperty( |
| 142 | + type=MeshMorpherSettings |
| 143 | + ) |
| 144 | + |
| 145 | + |
| 146 | +def unregister(): |
| 147 | + bpy.utils.unregister_class(MeshMorpherSettings) |
| 148 | + bpy.utils.unregister_class(OBJECT_OT_ProcessShapeKeys) |
| 149 | + bpy.utils.unregister_class(VIEW3D_PT_MeshMorpher) |
| 150 | + del bpy.types.Scene.mesh_morpher_settings |
| 151 | + |
| 152 | + |
| 153 | +if __name__ == "__main__": |
| 154 | + register() |
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