Merge pull request godotengine#102105 from clayjohn/SDFGI-unflip-normal

Avoid flipping normal based on facing direction when calculating SDF

Author: Repiteo

servers/rendering/renderer_rd/shaders/forward_clustered/scene_forward_clustered.glsl

@@ -2603,7 +2603,7 @@ void fragment_shader(in SceneData scene_data) {
 				vec3(0, -1, 0),
 				vec3(0, 0, -1));
 
-		vec3 cam_normal = mat3(scene_data.inv_view_matrix) * geo_normal;
+		vec3 cam_normal = mat3(scene_data.inv_view_matrix) * normalize(normal_interp);
 
 		float closest_dist = -1e20;