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Multiple materials per single mesh object support #251

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Multiple materials per single mesh object support #251

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54 changes: 40 additions & 14 deletions io_mesh_w3d/common/utils/material_import.py
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Original file line number Diff line number Diff line change
Expand Up @@ -13,22 +13,48 @@
# vertex material
##########################################################################

def create_vertex_material(context, principleds, structure, mesh, b_mesh, name, triangles):
for vertMat in structure.vert_materials:
(material, principled) = create_material_from_vertex_material(name, vertMat)
mesh.materials.append(material)
principleds.append(principled)

for mat_pass in structure.material_passes:
create_uvlayer(context, mesh, b_mesh, triangles, mat_pass)

if mat_pass.tx_stages:
tx_stage = mat_pass.tx_stages[0]
mat_id = mat_pass.vertex_material_ids[0]
tex_id = tx_stage.tx_ids[0][0]
def create_vertex_material(context, principleds, structure, mesh, b_mesh, name, triangles, mesh_ob):

if len(structure.material_passes) == 1 and len(structure.textures) > 1: # condition for multiple materials per single mesh object
# Create the same amount of materials as textures used for this mesh
source_mat = structure.vert_materials[0]
for texture in structure.textures:
source_mat.vm_name = texture.id
(material, principled) = create_material_from_vertex_material(name, source_mat)
mesh.materials.append(material)
principleds.append(principled)

create_uvlayer(context, mesh, b_mesh, triangles, structure.material_passes[0])

# Load textures
for tex_id, texture in enumerate(structure.textures):
texture = structure.textures[tex_id]
tex = find_texture(context, texture.file, texture.id)
principleds[mat_id].base_color_texture.image = tex
principleds[tex_id].base_color_texture.image = tex

# Assign material to appropriate object faces
bpy.ops.object.mode_set(mode = 'EDIT')
bm = bmesh.from_edit_mesh(mesh_ob.data)
bm.faces.ensure_lookup_table()
for i, face in enumerate(bm.faces):
bm.faces[i].material_index = structure.material_passes[0].tx_stages[0].tx_ids[0][i]
bpy.ops.object.mode_set(mode = 'OBJECT')
else:
for vertMat in structure.vert_materials:
(material, principled) = create_material_from_vertex_material(name, vertMat)
mesh.materials.append(material)
principleds.append(principled)

for mat_pass in structure.material_passes:
create_uvlayer(context, mesh, b_mesh, triangles, mat_pass)

if mat_pass.tx_stages:
tx_stage = mat_pass.tx_stages[0]
mat_id = mat_pass.vertex_material_ids[0]
tex_id = tx_stage.tx_ids[0][0]
texture = structure.textures[tex_id]
tex = find_texture(context, texture.file, texture.id)
principleds[mat_id].base_color_texture.image = tex


def create_material_from_vertex_material(name, vert_mat):
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4 changes: 2 additions & 2 deletions io_mesh_w3d/common/utils/mesh_import.py
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Original file line number Diff line number Diff line change
Expand Up @@ -68,13 +68,13 @@ def create_mesh(context, mesh_struct, coll):
b_mesh.from_mesh(mesh)

if mesh_struct.vert_materials:
create_vertex_material(context, principleds, mesh_struct, mesh, b_mesh, name, triangles)
create_vertex_material(context, principleds, mesh_struct, mesh, b_mesh, name, triangles, mesh_ob)

for i, shader in enumerate(mesh_struct.shaders):
set_shader_properties(mesh.materials[min(i, len(mesh.materials) - 1)], shader)

elif mesh_struct.prelit_vertex:
create_vertex_material(context, principleds, mesh_struct.prelit_vertex, mesh, b_mesh, name, triangles)
create_vertex_material(context, principleds, mesh_struct.prelit_vertex, mesh, b_mesh, name, triangles, mesh_ob)

for i, shader in enumerate(mesh_struct.prelit_vertex.shaders):
set_shader_properties(mesh.materials[i], shader)
Expand Down