Initial blender importing

Author: Pyogenics

io_scene_a3d/A3D.py

@@ -203,7 +203,7 @@ def readTransformBlock3(self, stream):
         # Read and assign transform ids
         for transformI in range(transformCount):
             transformID, = unpackStream("<I", stream)
-            self.transforms[transformID] = transforms[transformI]
+            self.transforms[transformI] = transforms[transformI] #XXX: The IDs seem to be incorrect and instead map to index?
 
         # Padding
         padding = calculatePadding(length)

io_scene_a3d/A3DObjects.py

@@ -135,7 +135,8 @@ def __init__(self):
         self.indexCount = 0
 
     def read2(self, stream):
-        self.indexCount, = unpackStream("<I", stream)*3
+        self.indexCount, = unpackStream("<I", stream) # This is just the face count so multiply it by 3
+        self.indexCount *= 3
         self.indices = list(unpackStream(f"<{self.indexCount}H", stream))
         self.smoothingGroups = list(unpackStream(f"<{self.indexCount//3}I", stream))
         self.materialID, = unpackStream("<H", stream)
@@ -195,7 +196,7 @@ def read3(self, stream):
 
         # Read material IDs
         for _ in range(self.materialCount):
-            materialID, = unpackStream("<I", stream)
+            materialID, = unpackStream("<i", stream)
             self.materialIDs.append(materialID)
 
         print(f"[A3DObject name: {self.name} meshID: {self.meshID} transformID: {self.transformID} materialIDs: {len(self.materialIDs)}]")

io_scene_a3d/__init__.py

@@ -0,0 +1,183 @@
+import bmesh
+import bpy
+from bpy.types import Operator
+from bpy.props import StringProperty, BoolProperty
+from bpy_extras.io_utils import ImportHelper
+from bpy_extras.node_shader_utils import PrincipledBSDFWrapper
+
+from .A3D import A3D
+from .A3DObjects import (
+    A3D_VERTEXTYPE_COORDINATE,
+    A3D_VERTEXTYPE_UV1,
+    A3D_VERTEXTYPE_NORMAL1,
+    A3D_VERTEXTYPE_UV2,
+    A3D_VERTEXTYPE_COLOR,
+    A3D_VERTEXTYPE_NORMAL2
+)
+
+'''
+Operators
+'''
+class ImportA3D(Operator, ImportHelper):
+    bl_idname = "import_scene.alternativa"
+    bl_label = "Import A3D"
+    bl_description = "Import an A3D model"
+
+    filter_glob: StringProperty(default="*.a3d", options={'HIDDEN'})
+
+    def invoke(self, context, event):
+        return ImportHelper.invoke(self, context, event)
+
+    def execute(self, context):
+        filepath = self.filepath
+        
+        # Read the file
+        print(f"Reading A3D data from {filepath}")
+        modelData = A3D()
+        with open(filepath, "rb") as file:
+            modelData.read(file)
+        
+        # Import data into blender
+        print("Importing mesh data into blender")
+        # Create materials
+        materials = []
+        for material in modelData.materials:
+            ma = bpy.data.materials.new(material.name)
+            maWrapper = PrincipledBSDFWrapper(ma, is_readonly=False, use_nodes=True)
+            maWrapper.base_color = material.color
+            maWrapper.roughness = 1.0
+
+            materials.append(ma)
+        # Build meshes
+        meshes = []
+        for mesh in modelData.meshes:
+            me = bpy.data.meshes.new(mesh.name)
+
+            # Gather all vertex data
+            coordinates = []
+            uv1 = []
+            normal1 = []
+            uv2 = []
+            colors = []
+            normal2 = []
+            for vertexBuffer in mesh.vertexBuffers:
+                if vertexBuffer.bufferType == A3D_VERTEXTYPE_COORDINATE:
+                    coordinates += vertexBuffer.data
+                elif vertexBuffer.bufferType == A3D_VERTEXTYPE_UV1:
+                    uv1 += vertexBuffer.data
+                elif vertexBuffer.bufferType == A3D_VERTEXTYPE_NORMAL1:
+                    normal1 += vertexBuffer.data
+                elif vertexBuffer.bufferType == A3D_VERTEXTYPE_UV2:
+                    uv2 += vertexBuffer.data
+                elif vertexBuffer.bufferType == A3D_VERTEXTYPE_COLOR:
+                    colors += vertexBuffer.data
+                elif vertexBuffer.bufferType == A3D_VERTEXTYPE_NORMAL2:
+                    normal2 += vertexBuffer.data
+
+            # Add blender vertices
+            blenderVertexIndices = []
+            blenderVertices = []
+            blenderUV1s = []
+            blenderUV2s = []
+            for submesh in mesh.submeshes:
+                polygonCount = len(submesh.indices) // 3
+                me.vertices.add(polygonCount*3)
+                me.loops.add(polygonCount*3)
+                me.polygons.add(polygonCount)
+
+                for indexI in range(submesh.indexCount):
+                    index = submesh.indices[indexI]
+                    blenderVertexIndices.append(indexI)
+                    blenderVertices += list(coordinates[index])
+                    blenderUV1s.append(uv1[index])
+                    #blenderUV2s += uv2[index]
+            me.vertices.foreach_set("co", blenderVertices)
+            me.polygons.foreach_set("loop_start", range(0, len(blenderVertices)//3, 3))
+            me.loops.foreach_set("vertex_index", blenderVertexIndices)
+
+            # UVs
+            if len(uv1) != 0:
+                uvData = me.uv_layers.new(name="UV1").data
+                for polygonI, po in enumerate(me.polygons):
+                    indexI = polygonI * 3
+                    uvData[po.loop_start].uv = blenderUV1s[blenderVertexIndices[indexI]]
+                    uvData[po.loop_start+1].uv = blenderUV1s[blenderVertexIndices[indexI+1]]
+                    uvData[po.loop_start+2].uv = blenderUV1s[blenderVertexIndices[indexI+2]]
+
+            # Apply materials (version 2)
+            faceIndexBase = 0
+            for submeshI, submesh in enumerate(mesh.submeshes):
+                if submesh.materialID == None:
+                    continue
+                me.materials.append(materials[submesh.materialID])
+                for faceI in range(submesh.indexCount//3):
+                    me.polygons[faceI+faceIndexBase].material_index = submeshI
+                faceIndexBase += submesh.indexCount//3
+
+            # Finalise
+            me.validate()
+            me.update()
+            meshes.append(me)
+        # Create objects
+        for objec in modelData.objects:
+            me = meshes[objec.meshID]
+            mesh = modelData.meshes[objec.meshID]
+            transform = modelData.transforms[objec.transformID]
+
+            # Select a name for the blender object
+            name = ""
+            if objec.name != "":
+                name = objec.name
+            elif mesh.name != "":
+                name = mesh.name
+            else:
+                name = transform.name
+
+            # Create the object
+            ob = bpy.data.objects.new(name, me)
+            bpy.context.collection.objects.link(ob)
+
+            # Set transform
+            ob.location = transform.position
+            ob.scale = transform.scale
+            ob.rotation_mode = "QUATERNION"
+            x, y, z, w = transform.rotation
+            ob.rotation_quaternion = (w, x, y, z)
+
+            # Apply materials (version 3)
+            for materialID in objec.materialIDs:
+                print(materialID)
+                if materialID == -1:
+                    continue
+                me.materials.append(materials[materialID])
+            # Set the default material to the first one we added
+            for polygon in me.polygons:
+                polygon.material_index = 0
+
+        return {"FINISHED"}
+
+'''
+Menu
+'''
+def menu_func_import_a3d(self, context):
+    self.layout.operator(ImportA3D.bl_idname, text="Alternativa3D HTML5 (.a3d)")
+
+'''
+Registration
+'''
+classes = [
+    ImportA3D
+]
+
+def register():
+    for c in classes:
+        bpy.utils.register_class(c)
+    bpy.types.TOPBAR_MT_file_import.append(menu_func_import_a3d)
+
+def unregister():
+    for c in classes:
+        bpy.utils.unregister_class(c)
+    bpy.types.TOPBAR_MT_file_import.remove(menu_func_import_a3d)
+
+if __name__ == "__main__":
+    register()