Object Occlusion Culling

leenkx/blender/lnx/props_renderpath.py

@@ -232,6 +232,15 @@ def update_renderpath(self, context):
     assets.invalidate_shader_cache(self, context)
     bpy.data.worlds['Lnx'].lnx_recompile = True
 
+def update_occlusion_culling(self, context):
+    for m in bpy.data.meshes:
+        m.lnx_cached = False
+    for c in bpy.data.curves:
+        c.lnx_cached = False
+    for c in bpy.data.metaballs:
+        c.lnx_cached = False
+    update_renderpath(self, context)
+
 def udpate_shadowmap_cascades(self, context):
     bpy.data.worlds['Lnx'].lnx_recompile = True
     update_renderpath(self, context)
@@ -461,6 +470,7 @@ class LnxRPListItem(bpy.types.PropertyGroup):
                ('Distance', 'Distance', 'Distance'),
                ('Index', 'Index', 'Index')],
         name='Draw Order', description='Sort objects', default='Auto', update=assets.invalidate_compiled_data)
+    lnx_radix: BoolProperty(name="Radix Sort", description="Sort draw calls with the radix library instead of the comparison sort", default=True, update=update_renderpath)
     rp_depth_texture: BoolProperty(name="Depth Texture", description="Current render-path state", default=False)
     rp_depth_texture_state: EnumProperty(
         items=[('On', 'On', 'On'),
@@ -697,8 +707,48 @@ class LnxRPListItem(bpy.types.PropertyGroup):
                ('CPU', 'CPU', 'CPU'),
                ('Off', 'Off', 'Off')],
         name='Particles', description='Enable particle simulation', default='GPU', update=assets.invalidate_shader_cache)
-    # Material override flags
-    lnx_culling: BoolProperty(name="Culling", default=True)
+    # Culling flags
+    lnx_backface_culling: BoolProperty(name="Backface Culling", description="Cull back-facing triangles (winding-based)", default=True)
+    lnx_frustum_culling: BoolProperty(name="Frustum Culling", description="Cull objects outside camera frustum", default=True)
+    lnx_occlusion_culling: BoolProperty(name="Object Occlusion Culling (Experimental)", description="Software occlusion culling using Hi-Z buffer", default=False, update=update_occlusion_culling)
+    lnx_occlusion_all_objects: BoolProperty(name="All Objects Occlude", description="Every mesh can occlude - ignores the per-object 'Is Occluder' flag", default=False, update=update_occlusion_culling)
+    lnx_occlusion_min_size: FloatProperty(name="Min Occluder Size", description="Objects whose largest bounding-box side is smaller than this (meters) never export as occluders", default=0.5, min=0.0, update=update_occlusion_culling)
+    lnx_occlusion_proxy_mode: EnumProperty(
+        name="Proxy Mode",
+        description="Occluder proxy geometry type",
+        items=[
+            ('box', 'Box', 'Axis-aligned bounding box - fastest, 12 triangles'),
+            ('convex', 'Convex Hull', 'Convex hull of the mesh - tight on convex shapes, over-covers concave ones'),
+            ('decimate', 'Decimate', 'Decimated mesh - closest fit, slowest export'),
+        ],
+        default='convex', update=update_occlusion_culling)
+    lnx_occlusion_proxy_shrink: FloatProperty(name="Proxy Shrink %", description="Shrink proxy toward its center: 0 = full size, 50 = half size (default), 100 = point - keeps occluders conservative", default=50.0, min=0.0, max=100.0, precision=1, update=update_occlusion_culling)
+    lnx_occlusion_box_shrink: IntProperty(name="Box Shrink %", description="0 = full AABB (aggressive), 50 = half-size (default, balanced), 100 = point (no occlusion)", default=50, min=0, max=100, update=update_renderpath)
+    lnx_occlusion_depth_eps: IntProperty(name="Depth Epsilon", description="6 = 1e-6 (default, tight), higher = more tolerant (less aggressive culling), lower = stricter", default=6, min=1, max=10, update=update_renderpath)
+    lnx_occlusion_decimate_ratio: FloatProperty(name="Ratio", description="Proportion of edges to collapse (COLLAPSE) or angle threshold in degrees (DISSOLVE) or iterations (UNSUBDIV)", default=0.5, min=0.01, max=1.0, precision=3, update=update_occlusion_culling)
+    lnx_occlusion_decimate_mode: EnumProperty(
+        name="Decimate Mode",
+        description="Decimate method applied to occluder proxy geometry",
+        items=[
+            ('COLLAPSE', 'Collapse', 'Collapse edges to reduce triangle count by ratio'),
+            ('DISSOLVE', 'Dissolve', 'Dissolve vertices with angle below threshold (ratio = degrees)'),
+            ('UNSUBDIV', 'Unsubdivide', 'Reverse subdivision (ratio = iterations, 0.1 = 1 iter, 1.0 = 10 iter)'),
+        ],
+        default='COLLAPSE', update=update_occlusion_culling)
+    lnx_aspect_mode: EnumProperty(
+        name="Aspect Ratio",
+        description="Pixel aspect ratio override for camera projection. 'Blender' uses the scene's resolution and pixel aspect settings",
+        items=[
+            ('blender', 'Blender', 'Use Blender\'s Output Properties resolution and pixel aspect ratio'),
+            ('square', 'Square (1.0)', 'Square pixels (1:1)'),
+            ('ntsc_43', 'NTSC 4:3', 'NTSC pixel aspect ratio (0.889)'),
+            ('pal_43', 'PAL 4:3', 'PAL pixel aspect ratio (1.067)'),
+            ('ntsc_169', 'NTSC 16:9', 'NTSC widescreen pixel aspect ratio (1.212)'),
+            ('pal_169', 'PAL 16:9', 'PAL widescreen pixel aspect ratio (1.459)'),
+            ('custom', 'Custom', 'Custom pixel aspect ratio'),
+        ],
+        default='blender')
+    lnx_aspect_custom: FloatProperty(name="Custom PAR", description="Custom pixel aspect ratio (width/height of a single pixel)", default=1.0, min=0.01, max=10.0, precision=3)
     lnx_two_sided_area_light: BoolProperty(name="Two-Sided Area Light", description="Emit light from both faces of area plane", default=False, update=assets.invalidate_shader_cache)
 
     @staticmethod