diff --git a/servers/rendering/renderer_rd/effects/copy_effects.cpp b/servers/rendering/renderer_rd/effects/copy_effects.cpp
index eba1c145e387..6d7ded3e81af 100644
--- a/servers/rendering/renderer_rd/effects/copy_effects.cpp
+++ b/servers/rendering/renderer_rd/effects/copy_effects.cpp
@@ -107,6 +107,7 @@ CopyEffects::CopyEffects(bool p_prefer_raster_effects) {
 		copy_modes.push_back("\n#define MULTIVIEW\n"); // COPY_TO_FB_MULTIVIEW
 		copy_modes.push_back("\n#define MULTIVIEW\n#define MODE_TWO_SOURCES\n"); // COPY_TO_FB_MULTIVIEW_WITH_DEPTH
 		copy_modes.push_back("\n#define MODE_SET_COLOR\n"); // COPY_TO_FB_SET_COLOR
+		copy_modes.push_back("\n#define MODE_OCCLUSION_CULLING_BUFFER\n"); // COPY_TO_FB_OCCLUSION_CULLING_BUFFER
 
 		copy_to_fb.shader.initialize(copy_modes);
 
@@ -117,11 +118,28 @@ CopyEffects::CopyEffects(bool p_prefer_raster_effects) {
 
 		copy_to_fb.shader_version = copy_to_fb.shader.version_create();
 
-		//use additive
-
 		for (int i = 0; i < COPY_TO_FB_MAX; i++) {
 			if (copy_to_fb.shader.is_variant_enabled(i)) {
-				copy_to_fb.pipelines[i].setup(copy_to_fb.shader.version_get_shader(copy_to_fb.shader_version, i), RD::RENDER_PRIMITIVE_TRIANGLES, RD::PipelineRasterizationState(), RD::PipelineMultisampleState(), RD::PipelineDepthStencilState(), RD::PipelineColorBlendState::create_disabled(), 0);
+				RD::PipelineColorBlendState blend_state;
+				if (i == COPY_TO_FB_OCCLUSION_CULLING_BUFFER) {
+					// Use additive blend mode.
+					RD::PipelineColorBlendState::Attachment ba;
+					ba.enable_blend = true;
+					ba.src_color_blend_factor = RD::BLEND_FACTOR_SRC_ALPHA;
+					ba.dst_color_blend_factor = RD::BLEND_FACTOR_ONE_MINUS_SRC_ALPHA;
+					ba.src_alpha_blend_factor = RD::BLEND_FACTOR_ONE;
+					ba.dst_alpha_blend_factor = RD::BLEND_FACTOR_ONE;
+					ba.color_blend_op = RD::BLEND_OP_ADD;
+					ba.alpha_blend_op = RD::BLEND_OP_MAXIMUM;
+
+					RD::PipelineColorBlendState blend_additive;
+					blend_additive.attachments.push_back(ba);
+					blend_state = blend_additive;
+				} else {
+					blend_state = RD::PipelineColorBlendState::create_disabled();
+				}
+
+				copy_to_fb.pipelines[i].setup(copy_to_fb.shader.version_get_shader(copy_to_fb.shader_version, i), RD::RENDER_PRIMITIVE_TRIANGLES, RD::PipelineRasterizationState(), RD::PipelineMultisampleState(), RD::PipelineDepthStencilState(), blend_state, 0);
 			} else {
 				copy_to_fb.pipelines[i].clear();
 			}
@@ -539,7 +557,7 @@ void CopyEffects::copy_to_atlas_fb(RID p_source_rd_texture, RID p_dest_framebuff
 	RD::get_singleton()->draw_list_draw(draw_list, true);
 }
 
-void CopyEffects::copy_to_fb_rect(RID p_source_rd_texture, RID p_dest_framebuffer, const Rect2i &p_rect, bool p_flip_y, bool p_force_luminance, bool p_alpha_to_zero, bool p_srgb, RID p_secondary, bool p_multiview, bool p_alpha_to_one, bool p_linear) {
+void CopyEffects::copy_to_fb_rect(RID p_source_rd_texture, RID p_dest_framebuffer, const Rect2i &p_rect, bool p_flip_y, bool p_force_luminance, bool p_alpha_to_zero, bool p_srgb, RID p_secondary, bool p_multiview, bool p_alpha_to_one, bool p_linear, bool p_occlusion_culling_buffer) {
 	UniformSetCacheRD *uniform_set_cache = UniformSetCacheRD::get_singleton();
 	ERR_FAIL_NULL(uniform_set_cache);
 	MaterialStorage *material_storage = MaterialStorage::get_singleton();
@@ -580,6 +598,10 @@ void CopyEffects::copy_to_fb_rect(RID p_source_rd_texture, RID p_dest_framebuffe
 		mode = p_secondary.is_valid() ? COPY_TO_FB_MULTIVIEW_WITH_DEPTH : COPY_TO_FB_MULTIVIEW;
 	} else {
 		mode = p_secondary.is_valid() ? COPY_TO_FB_COPY2 : COPY_TO_FB_COPY;
+
+		if (p_occlusion_culling_buffer) {
+			mode = COPY_TO_FB_OCCLUSION_CULLING_BUFFER;
+		}
 	}
 
 	RID shader = copy_to_fb.shader.version_get_shader(copy_to_fb.shader_version, mode);
diff --git a/servers/rendering/renderer_rd/effects/copy_effects.h b/servers/rendering/renderer_rd/effects/copy_effects.h
index 470ac1acee2c..4d46f1fd88e8 100644
--- a/servers/rendering/renderer_rd/effects/copy_effects.h
+++ b/servers/rendering/renderer_rd/effects/copy_effects.h
@@ -177,6 +177,7 @@ class CopyEffects {
 		COPY_TO_FB_MULTIVIEW_WITH_DEPTH,
 
 		COPY_TO_FB_SET_COLOR,
+		COPY_TO_FB_OCCLUSION_CULLING_BUFFER,
 		COPY_TO_FB_MAX,
 	};
 
@@ -326,7 +327,7 @@ class CopyEffects {
 	void copy_cubemap_to_panorama(RID p_source_cube, RID p_dest_panorama, const Size2i &p_panorama_size, float p_lod, bool p_is_array);
 	void copy_depth_to_rect(RID p_source_rd_texture, RID p_dest_framebuffer, const Rect2i &p_rect, bool p_flip_y = false);
 	void copy_depth_to_rect_and_linearize(RID p_source_rd_texture, RID p_dest_texture, const Rect2i &p_rect, bool p_flip_y, float p_z_near, float p_z_far);
-	void copy_to_fb_rect(RID p_source_rd_texture, RID p_dest_framebuffer, const Rect2i &p_rect, bool p_flip_y = false, bool p_force_luminance = false, bool p_alpha_to_zero = false, bool p_srgb = false, RID p_secondary = RID(), bool p_multiview = false, bool alpha_to_one = false, bool p_linear = false);
+	void copy_to_fb_rect(RID p_source_rd_texture, RID p_dest_framebuffer, const Rect2i &p_rect, bool p_flip_y = false, bool p_force_luminance = false, bool p_alpha_to_zero = false, bool p_srgb = false, RID p_secondary = RID(), bool p_multiview = false, bool alpha_to_one = false, bool p_linear = false, bool p_occlusion_culling_buffer = false);
 	void copy_to_atlas_fb(RID p_source_rd_texture, RID p_dest_framebuffer, const Rect2 &p_uv_rect, RD::DrawListID p_draw_list, bool p_flip_y = false, bool p_panorama = false);
 	void copy_raster(RID p_source_texture, RID p_dest_framebuffer);
 
diff --git a/servers/rendering/renderer_rd/renderer_scene_render_rd.cpp b/servers/rendering/renderer_rd/renderer_scene_render_rd.cpp
index 646bdc543683..34ce341a29e4 100644
--- a/servers/rendering/renderer_rd/renderer_scene_render_rd.cpp
+++ b/servers/rendering/renderer_rd/renderer_scene_render_rd.cpp
@@ -736,7 +736,7 @@ void RendererSceneRenderRD::_render_buffers_debug_draw(const RenderDataRD *p_ren
 	if (debug_draw == RS::VIEWPORT_DEBUG_DRAW_OCCLUDERS) {
 		if (p_render_data->occluder_debug_tex.is_valid()) {
 			Size2i rtsize = texture_storage->render_target_get_size(render_target);
-			copy_effects->copy_to_fb_rect(texture_storage->texture_get_rd_texture(p_render_data->occluder_debug_tex), texture_storage->render_target_get_rd_framebuffer(render_target), Rect2i(Vector2(), rtsize), true, false);
+			copy_effects->copy_to_fb_rect(texture_storage->texture_get_rd_texture(p_render_data->occluder_debug_tex), texture_storage->render_target_get_rd_framebuffer(render_target), Rect2i(Vector2(), rtsize), true, false, false, false, RID(), false, false, false, true);
 		}
 	}
 
diff --git a/servers/rendering/renderer_rd/shaders/effects/copy_to_fb.glsl b/servers/rendering/renderer_rd/shaders/effects/copy_to_fb.glsl
index 613722416270..f1614d470b28 100644
--- a/servers/rendering/renderer_rd/shaders/effects/copy_to_fb.glsl
+++ b/servers/rendering/renderer_rd/shaders/effects/copy_to_fb.glsl
@@ -193,6 +193,14 @@ void main() {
 		color.rgb = srgb_to_linear(color.rgb);
 	}
 
+#ifdef MODE_OCCLUSION_CULLING_BUFFER
+	// Modify result to make the background partially visible,
+	// which helps with 3D navigation.
+	// This relies on the additive blend state from the `CopyEffects()` constructor.
+	color.a = (1.0 - color.r) * 0.5;
+	color.rgb = vec3(1.0, 0.0, 0.0);
+#endif // MODE_OCCLUSION_CULLING_BUFFER
+
 	frag_color = color / params.luminance_multiplier;
 #endif // MODE_SET_COLOR
 }