diff --git a/material_maker/panels/preview_2d/preview_2d_panel.gd b/material_maker/panels/preview_2d/preview_2d_panel.gd
index d545e125..179df974 100644
--- a/material_maker/panels/preview_2d/preview_2d_panel.gd
+++ b/material_maker/panels/preview_2d/preview_2d_panel.gd
@@ -57,26 +57,33 @@ func set_temporal_aa(v : bool):
 		yield(get_tree(), "idle_frame")
 	set_generator(generator, output, true)
 
+var start_accumulate_trigger : bool = false
+
 func start_accumulate():
+	if !temporal_aa_current:
+		return
+	if !start_accumulate_trigger:
+		start_accumulate_trigger = true
+		call_deferred("do_start_accumulate")
+
+func do_start_accumulate():
 	started = false
 	yield(get_tree(), "idle_frame")
 	yield(get_tree(), "idle_frame")
-	yield(get_tree(), "idle_frame")
-
+	start_accumulate_trigger = false
 	$Accumulate/Iteration.material.set_shader_param("sum", $Accumulate.get_texture())
 	$Accumulate/Iteration.material.set_shader_param("clear", true)
-	divide = 0
+	divide = 1
 	started = true
 	while started:
-		var next_divide = divide + 1
 		$Accumulate.render_target_update_mode = Viewport.UPDATE_ONCE
 		$Accumulate.update_worlds()
+		material.set_shader_param("divide", divide)
 		yield(get_tree(), "idle_frame")
 		yield(get_tree(), "idle_frame")
 		$Accumulate/Iteration.material.set_shader_param("clear", false)
-		material.set_shader_param("divide", divide)
-		divide = next_divide
-		if divide > 1000:
+		divide += 1
+		if divide > 100000:
 			started = false
 			break
 
diff --git a/material_maker/panels/preview_2d/preview_2d_panel.tscn b/material_maker/panels/preview_2d/preview_2d_panel.tscn
index 87a2a9cd..7d05257e 100644
--- a/material_maker/panels/preview_2d/preview_2d_panel.tscn
+++ b/material_maker/panels/preview_2d/preview_2d_panel.tscn
@@ -62,12 +62,12 @@ uniform float preview_2d_scale = 1.2;
 uniform vec2 preview_2d_center = vec2(0.5);
 
 void fragment() {
+	vec2 ratio = preview_2d_size;
+	vec2 jitter_uv = UV+0.75*fract(sin(vec2(TIME, TIME*0.5)*43758.5453123))/preview_2d_size;
+	vec2 uv = preview_2d_center+(jitter_uv-0.5)*preview_2d_scale*ratio/min(ratio.x, ratio.y);
 	if (clear) {
-		COLOR = vec4(0.0, 0.0, 0.0, 1.0);
+		COLOR = preview_2d(uv);
 	} else {
-		vec2 ratio = preview_2d_size;
-		vec2 jitter_uv = UV+0.75*fract(sin(vec2(TIME, TIME*0.5)*43758.5453123))/preview_2d_size;
-		vec2 uv = preview_2d_center+(jitter_uv-0.5)*preview_2d_scale*ratio/min(ratio.x, ratio.y);
 		COLOR = textureLod(sum, UV, 0.0)+preview_2d(uv);
 	}
 }