Merge pull request #57535 from Calinou/visibility-range-fade-use-easing

servers/rendering/renderer_rd/forward_clustered/render_forward_clustered.cpp

@@ -969,10 +969,11 @@ void RenderForwardClustered::_fill_render_list(RenderListType p_render_list, con
 
 		if (inst->fade_near || inst->fade_far) {
 			float fade_dist = inst->transform.origin.distance_to(p_render_data->cam_transform.origin);
+			// Use `smoothstep()` to make opacity changes more gradual and less noticeable to the player.
 			if (inst->fade_far && fade_dist > inst->fade_far_begin) {
-				fade_alpha = MAX(0.0, 1.0 - (fade_dist - inst->fade_far_begin) / (inst->fade_far_end - inst->fade_far_begin));
+				fade_alpha = Math::smoothstep(0.0f, 1.0f, 1.0f - (fade_dist - inst->fade_far_begin) / (inst->fade_far_end - inst->fade_far_begin));
 			} else if (inst->fade_near && fade_dist < inst->fade_near_end) {
-				fade_alpha = MAX(0.0, (fade_dist - inst->fade_near_begin) / (inst->fade_near_end - inst->fade_near_begin));
+				fade_alpha = Math::smoothstep(0.0f, 1.0f, (fade_dist - inst->fade_near_begin) / (inst->fade_near_end - inst->fade_near_begin));
 			}
 		}