Fix orthogonal camera auto LOD calculation

- Do not take orthogonal camera's distance into account when calculating LOD.
- Only take into account screen size taken up.

servers/rendering/renderer_rd/forward_clustered/render_forward_clustered.cpp

@@ -1081,6 +1081,10 @@ void RenderForwardClustered::_fill_render_list(RenderListType p_render_list, con
 					distance = -distance_max;
 				}
 
+				if (p_render_data->cam_ortogonal) {
+					distance = 1.0;
+				}
+
 				uint32_t indices;
 				surf->sort.lod_index = storage->mesh_surface_get_lod(surf->surface, inst->lod_model_scale * inst->lod_bias, distance * p_render_data->lod_distance_multiplier, p_render_data->screen_mesh_lod_threshold, &indices);
 				if (p_render_data->render_info) {

servers/rendering/renderer_rd/forward_mobile/render_forward_mobile.cpp

@@ -1429,6 +1429,10 @@ void RenderForwardMobile::_fill_render_list(RenderListType p_render_list, const
 					distance = -distance_max;
 				}
 
+				if (p_render_data->cam_ortogonal) {
+					distance = 1.0;
+				}
+
 				uint32_t indices;
 				surf->lod_index = storage->mesh_surface_get_lod(surf->surface, inst->lod_model_scale * inst->lod_bias, distance * p_render_data->lod_distance_multiplier, p_render_data->screen_mesh_lod_threshold, &indices);
 				if (p_render_data->render_info) {