Fixed several bugs with directional light, and changed defaults to be more sensible.

1 files changed, 18 insertions, 5 deletions

diff --git a/servers/visual/visual_server_scene.cpp b/servers/visual/visual_server_scene.cpp
index b905b230dc..352daa9655 100644
--- a/servers/visual/visual_server_scene.cpp
+++ b/servers/visual/visual_server_scene.cpp
@@ -1347,6 +1347,8 @@ void VisualServerScene::_light_instance_update_shadow(Instance *p_instance, cons
 
 			bool overlap = VSG::storage->light_directional_get_blend_splits(p_instance->base);
 
+			float first_radius = 0.0;
+
 			for (int i = 0; i < splits; i++) {
 
 				// setup a camera matrix for that range!
@@ -1373,9 +1375,11 @@ void VisualServerScene::_light_instance_update_shadow(Instance *p_instance, cons
 
 				// obtain the light frustm ranges (given endpoints)
 
-				Vector3 x_vec = p_instance->transform.basis.get_axis(Vector3::AXIS_X).normalized();
-				Vector3 y_vec = p_instance->transform.basis.get_axis(Vector3::AXIS_Y).normalized();
-				Vector3 z_vec = p_instance->transform.basis.get_axis(Vector3::AXIS_Z).normalized();
+				Transform transform = p_instance->transform.orthonormalized(); //discard scale and stabilize light
+
+				Vector3 x_vec = transform.basis.get_axis(Vector3::AXIS_X).normalized();
+				Vector3 y_vec = transform.basis.get_axis(Vector3::AXIS_Y).normalized();
+				Vector3 z_vec = transform.basis.get_axis(Vector3::AXIS_Z).normalized();
 				//z_vec points agsint the camera, like in default opengl
 
 				float x_min, x_max;
@@ -1386,7 +1390,10 @@ void VisualServerScene::_light_instance_update_shadow(Instance *p_instance, cons
 				float y_min_cam, y_max_cam;
 				float z_min_cam, z_max_cam;
 
+				float bias_scale = 1.0;
+
 				//used for culling
+
 				for (int j = 0; j < 8; j++) {
 
 					float d_x = x_vec.dot(endpoints[j]);
@@ -1435,6 +1442,12 @@ void VisualServerScene::_light_instance_update_shadow(Instance *p_instance, cons
 
 					radius *= texture_size / (texture_size - 2.0); //add a texel by each side, so stepified texture will always fit
 
+					if (i == 0) {
+						first_radius = radius;
+					} else {
+						bias_scale = radius / first_radius;
+					}
+
 					x_max_cam = x_vec.dot(center) + radius;
 					x_min_cam = x_vec.dot(center) - radius;
 					y_max_cam = y_vec.dot(center) + radius;
@@ -1493,10 +1506,10 @@ void VisualServerScene::_light_instance_update_shadow(Instance *p_instance, cons
 					ortho_camera.set_orthogonal(-half_x, half_x, -half_y, half_y, 0, (z_max - z_min_cam));
 
 					Transform ortho_transform;
-					ortho_transform.basis = p_instance->transform.basis;
+					ortho_transform.basis = transform.basis;
 					ortho_transform.origin = x_vec * (x_min_cam + half_x) + y_vec * (y_min_cam + half_y) + z_vec * z_max;
 
-					VSG::scene_render->light_instance_set_shadow_transform(light->instance, ortho_camera, ortho_transform, 0, distances[i + 1], i);
+					VSG::scene_render->light_instance_set_shadow_transform(light->instance, ortho_camera, ortho_transform, 0, distances[i + 1], i, bias_scale);
 				}
 
 				VSG::scene_render->render_shadow(light->instance, p_shadow_atlas, i, (RasterizerScene::InstanceBase **)instance_shadow_cull_result, cull_count);