Read SHDW chunks

addons/io_scene_swbf_msh/msh_model.py

@@ -39,6 +39,20 @@ class VertexWeight:
     weight: float = 1.0
     bone: int = 0
 
+
+@dataclass 
+class ShadowGeometry:
+    """ Class representing 'SHDW' chunks. """
+
+    # Perhaps I could just use the positions list in the segment
+    # class, but I don't know if SHDW info can coexist with 
+    # a normal geometry segment...
+    positions: List[Vector] = field(default_factory=list)
+   
+    # The second two entries may not be necessary...
+    edges: List[Tuple[int,int,int,int]] = field(default_factory=list)
+
+
 @dataclass
 class GeometrySegment:
     """ Class representing a 'SEGM' section in a .msh file. """
@@ -56,6 +70,7 @@ class GeometrySegment:
     triangles: List[List[int]] = field(default_factory=list)
     triangle_strips: List[List[int]] = None
 
+    shadow_geometry: ShadowGeometry = None
 
 @dataclass
 class CollisionPrimitive:

addons/io_scene_swbf_msh/msh_scene_read.py

@@ -388,6 +388,28 @@ def _read_segm(segm: Reader, materials_list: List[Material]) -> GeometrySegment:
             #if segm.read_u16 != 0: 
             #    segm.skip_bytes(-2)
        
+        elif next_header == "SHDW":
+            
+            shadow_geometry = ShadowGeometry()
+
+            with segm.read_child() as shdw:
+                #print("Found shadow chunk")
+
+                num_positions = shdw.read_u32()
+                #print(f"  Num verts in shadow mesh: {num_positions}")
+                shadow_geometry.positions = [shdw.read_vec() for _ in range(num_positions)]
+
+                num_edges = shdw.read_u32()
+                #print(f" Num edges in shadow mesh: {num_edges}")
+                edges = []
+                for i in range(num_edges):
+                    edges.append(tuple(shdw.read_u16(4)))
+                    #print("    " + str(edges[-1]))
+                shadow_geometry.edges = edges
+
+            geometry_seg.shadow_geometry = shadow_geometry    
+
+                
         elif next_header == "WGHT":
             with segm.read_child() as wght: