[Blender] Implemented tesselation for CAD-model, retopology and optimisation tesselation's result, assigning physical properties with assigned material

cg/blender/utils/generative_modifiers.py

@@ -0,0 +1,161 @@
+# -*- coding: utf-8 -*-
+# Copyright (C) 2023 Ilia Kurochkin <brothermechanic@gmail.com>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+'''
+DESCRIPTION.
+Basic mesh processing for asset pipeline.
+'''
+__version__ = '0.1'
+
+import logging
+import bpy
+
+logger = logging.getLogger(__name__)
+logging.basicConfig(level=logging.INFO)
+
+
+def shell_remesher(lowpoly_obj, mod_name='shell_mod', tree_name='shell_tree'):
+    ''' Conctruct geometry nodes modifier. '''
+
+    modifier = lowpoly_obj.modifiers.new(mod_name, type='NODES')
+    tree = bpy.data.node_groups.new(name=tree_name, type='GeometryNodeTree')
+    modifier.node_group = tree
+
+    group_input = tree.nodes.new(type='NodeGroupInput')
+
+    collection_info = tree.nodes.new(type='GeometryNodeCollectionInfo')
+    collection_info.location = (300, 0)
+    collection_info.transform_space = 'RELATIVE'
+
+    tree.inputs.new('NodeSocketCollection', 'Collection')
+    tree.links.new(group_input.outputs['Collection'],
+                   collection_info.inputs['Collection'])
+
+    realize_instances = tree.nodes.new(type='GeometryNodeRealizeInstances')
+    realize_instances.location = (600, 0)
+
+    tree.links.new(collection_info.outputs[0],
+                   realize_instances.inputs['Geometry'])
+
+    mesh_to_volume = tree.nodes.new(type='GeometryNodeMeshToVolume')
+    mesh_to_volume.location = (900, 0)
+    mesh_to_volume.resolution_mode = 'VOXEL_SIZE'
+    mesh_to_volume.inputs['Density'].default_value = 10.0
+    mesh_to_volume.inputs['Voxel Size'].default_value = 0.005
+    mesh_to_volume.inputs['Exterior Band Width'].default_value = 0.005
+
+    tree.links.new(realize_instances.outputs['Geometry'],
+                   mesh_to_volume.inputs['Mesh'])
+
+    volume_to_mesh = tree.nodes.new(type='GeometryNodeVolumeToMesh')
+    volume_to_mesh.location = (1200, 0)
+
+    tree.links.new(mesh_to_volume.outputs['Volume'],
+                   volume_to_mesh.inputs['Volume'])
+
+    extrude_mesh = tree.nodes.new(type='GeometryNodeExtrudeMesh')
+    extrude_mesh.location = (1500, 0)
+    extrude_mesh.inputs['Offset Scale'].default_value = 0.001
+    extrude_mesh.inputs['Individual'].default_value = False
+
+    tree.links.new(volume_to_mesh.outputs['Mesh'],
+                   extrude_mesh.inputs['Mesh'])
+
+    # 1 pass
+    mesh_to_volume = tree.nodes.new(type='GeometryNodeMeshToVolume')
+    mesh_to_volume.location = (1800, 0)
+    mesh_to_volume.resolution_mode = 'VOXEL_SIZE'
+    mesh_to_volume.inputs['Density'].default_value = 1.0
+    mesh_to_volume.inputs['Voxel Size'].default_value = 0.003
+    mesh_to_volume.inputs['Exterior Band Width'].default_value = 0.003
+
+    tree.links.new(extrude_mesh.outputs['Mesh'],
+                   mesh_to_volume.inputs['Mesh'])
+
+    volume_to_mesh = tree.nodes.new(type='GeometryNodeVolumeToMesh')
+    volume_to_mesh.location = (2100, 0)
+
+    tree.links.new(mesh_to_volume.outputs['Volume'],
+                   volume_to_mesh.inputs['Volume'])
+
+    set_position_01 = tree.nodes.new(type='GeometryNodeSetPosition')
+    set_position_01.location = (2400, -300)
+
+    tree.links.new(volume_to_mesh.outputs['Mesh'],
+                   set_position_01.inputs['Geometry'])
+
+    # 2 pass
+    mesh_to_volume = tree.nodes.new(type='GeometryNodeMeshToVolume')
+    mesh_to_volume.location = (2700, 0)
+    mesh_to_volume.resolution_mode = 'VOXEL_SIZE'
+    mesh_to_volume.inputs['Density'].default_value = 1.0
+    mesh_to_volume.inputs['Voxel Size'].default_value = 0.001
+    mesh_to_volume.inputs['Exterior Band Width'].default_value = 0.001
+
+    tree.links.new(set_position_01.outputs['Geometry'],
+                   mesh_to_volume.inputs['Mesh'])
+
+    volume_to_mesh = tree.nodes.new(type='GeometryNodeVolumeToMesh')
+    volume_to_mesh.location = (3000, 0)
+
+    tree.links.new(mesh_to_volume.outputs['Volume'],
+                   volume_to_mesh.inputs['Volume'])
+
+    set_position_02 = tree.nodes.new(type='GeometryNodeSetPosition')
+    set_position_02.location = (3300, -300)
+
+    tree.links.new(volume_to_mesh.outputs['Mesh'],
+                   set_position_02.inputs['Geometry'])
+
+    # 3 pass
+    mesh_to_volume = tree.nodes.new(type='GeometryNodeMeshToVolume')
+    mesh_to_volume.location = (3600, 0)
+    mesh_to_volume.resolution_mode = 'VOXEL_SIZE'
+    mesh_to_volume.inputs['Density'].default_value = 1.0
+    mesh_to_volume.inputs['Voxel Size'].default_value = 0.0005
+    mesh_to_volume.inputs['Exterior Band Width'].default_value = 0.0001
+
+    tree.links.new(set_position_02.outputs['Geometry'],
+                   mesh_to_volume.inputs['Mesh'])
+
+    volume_to_mesh = tree.nodes.new(type='GeometryNodeVolumeToMesh')
+    volume_to_mesh.location = (3900, 0)
+
+    tree.links.new(mesh_to_volume.outputs['Volume'],
+                   volume_to_mesh.inputs['Volume'])
+
+    set_position_03 = tree.nodes.new(type='GeometryNodeSetPosition')
+    set_position_03.location = (4200, -300)
+
+    tree.links.new(volume_to_mesh.outputs['Mesh'],
+                   set_position_03.inputs['Geometry'])
+
+    group_output = tree.nodes.new(type='NodeGroupOutput')
+    group_output.location = (4500, 0)
+
+    tree.outputs.new('NodeSocketGeometry', 'Geometry')
+    tree.links.new(set_position_03.outputs['Geometry'],
+                   group_output.inputs['Geometry'])
+
+    geometry_proximity = tree.nodes.new(type='GeometryNodeProximity')
+    geometry_proximity.location = (1200, -1000)
+
+    tree.links.new(realize_instances.outputs['Geometry'],
+                   geometry_proximity.inputs['Target'])
+    tree.links.new(geometry_proximity.outputs['Position'],
+                   set_position_01.inputs['Position'])
+    tree.links.new(geometry_proximity.outputs['Position'],
+                   set_position_02.inputs['Position'])
+    tree.links.new(geometry_proximity.outputs['Position'],
+                   set_position_03.inputs['Position'])
+
+    return modifier