Merge pull request #79590 from 0010200303/master

Fix bad LOD selection when Camera in Mesh AABB

servers/rendering/renderer_rd/forward_clustered/render_forward_clustered.cpp

@@ -944,25 +944,27 @@ void RenderForwardClustered::_fill_render_list(RenderListType p_render_list, con
 			// LOD
 
 			if (p_render_data->scene_data->screen_mesh_lod_threshold > 0.0 && mesh_storage->mesh_surface_has_lod(surf->surface)) {
-				// Get the LOD support points on the mesh AABB.
-				Vector3 lod_support_min = inst->transformed_aabb.get_support(p_render_data->scene_data->cam_transform.basis.get_column(Vector3::AXIS_Z));
-				Vector3 lod_support_max = inst->transformed_aabb.get_support(-p_render_data->scene_data->cam_transform.basis.get_column(Vector3::AXIS_Z));
-
-				// Get the distances to those points on the AABB from the camera origin.
-				float distance_min = (float)p_render_data->scene_data->cam_transform.origin.distance_to(lod_support_min);
-				float distance_max = (float)p_render_data->scene_data->cam_transform.origin.distance_to(lod_support_max);
-
 				float distance = 0.0;
 
-				if (distance_min * distance_max < 0.0) {
-					//crossing plane
-					distance = 0.0;
-				} else if (distance_min >= 0.0) {
-					distance = distance_min;
-				} else if (distance_max <= 0.0) {
-					distance = -distance_max;
+				// Check if camera is NOT inside the mesh AABB.
+				if (!inst->transformed_aabb.has_point(p_render_data->scene_data->cam_transform.origin)) {
+					// Get the LOD support points on the mesh AABB.
+					Vector3 lod_support_min = inst->transformed_aabb.get_support(p_render_data->scene_data->cam_transform.basis.get_column(Vector3::AXIS_Z));
+					Vector3 lod_support_max = inst->transformed_aabb.get_support(-p_render_data->scene_data->cam_transform.basis.get_column(Vector3::AXIS_Z));
+
+					// Get the distances to those points on the AABB from the camera origin.
+					float distance_min = (float)p_render_data->scene_data->cam_transform.origin.distance_to(lod_support_min);
+					float distance_max = (float)p_render_data->scene_data->cam_transform.origin.distance_to(lod_support_max);
+
+					if (distance_min * distance_max < 0.0) {
+						//crossing plane
+						distance = 0.0;
+					} else if (distance_min >= 0.0) {
+						distance = distance_min;
+					} else if (distance_max <= 0.0) {
+						distance = -distance_max;
+					}
 				}
-
 				if (p_render_data->scene_data->cam_orthogonal) {
 					distance = 1.0;
 				}