Merge pull request #101952 from Flarkk/fix_spotlight_peterpanning_regression

Fix shadow peter-panning with default spotlight

servers/rendering/renderer_rd/shaders/scene_forward_lights_inc.glsl

@@ -733,7 +733,7 @@ void light_process_spot(uint idx, vec3 vertex, vec3 eye_vec, vec3 normal, vec3 v
 		vec4 v = vec4(vertex + normal_bias, 1.0);
 
 		vec4 splane = (spot_lights.data[idx].shadow_matrix * v);
-		splane.z += spot_lights.data[idx].shadow_bias / (light_length * spot_lights.data[idx].inv_radius);
+		splane.z += spot_lights.data[idx].shadow_bias;
 		splane /= splane.w;
 
 		if (sc_use_light_soft_shadows() && spot_lights.data[idx].soft_shadow_size > 0.0) {

servers/rendering/renderer_scene_cull.cpp

@@ -2510,7 +2510,7 @@ bool RendererSceneCull::_light_instance_update_shadow(Instance *p_instance, cons
 				}
 
 				real_t radius = RSG::light_storage->light_get_param(p_instance->base, RS::LIGHT_PARAM_RANGE);
-				real_t z_near = MIN(0.005f, radius);
+				real_t z_near = MIN(0.025f, radius);
 				Projection cm;
 				cm.set_perspective(90, 1, z_near, radius);
 
@@ -2600,7 +2600,7 @@ bool RendererSceneCull::_light_instance_update_shadow(Instance *p_instance, cons
 
 			real_t radius = RSG::light_storage->light_get_param(p_instance->base, RS::LIGHT_PARAM_RANGE);
 			real_t angle = RSG::light_storage->light_get_param(p_instance->base, RS::LIGHT_PARAM_SPOT_ANGLE);
-			real_t z_near = MIN(0.005f, radius);
+			real_t z_near = MIN(0.025f, radius);
 
 			Projection cm;
 			cm.set_perspective(angle * 2.0, 1.0, z_near, radius);