diff --git a/addons/material_maker/common.shader b/addons/material_maker/common.shader
index 37e008b5..3b48408b 100644
--- a/addons/material_maker/common.shader
+++ b/addons/material_maker/common.shader
@@ -13,32 +13,43 @@ vec3 rand3(vec2 x) {
                           dot(x, vec2(13.254, 5.867)))) * 43758.5453);
 }
 
-float circle(vec2 uv, float sides, float radius, float edge) {
+float circle(vec2 uv, float sides, float size, float edge) {
     uv = 2.0*uv-1.0;
 	edge = max(edge, 1.0e-8);
     float distance = length(uv);
-    return clamp((1.0-distance/radius)/edge, 0.0, 1.0);
+    return clamp((1.0-distance/size)/edge, 0.0, 1.0);
 }
 
-float polygon(vec2 uv, float sides, float radius, float edge) {
+float polygon(vec2 uv, float sides, float size, float edge) {
     uv = 2.0*uv-1.0;
+	edge = max(edge, 1.0e-8);
     float angle = atan(uv.x, uv.y)+3.14159265359;
     float slice = 6.28318530718/sides;
-    return clamp((radius-cos(floor(0.5+angle/slice)*slice-angle)*length(uv))/(edge*radius), 0.0, 1.0);
+    return clamp((size-cos(floor(0.5+angle/slice)*slice-angle)*length(uv))/(edge*size), 0.0, 1.0);
 }
 
-float star(vec2 uv, float sides, float radius, float edge) {
+float star(vec2 uv, float sides, float size, float edge) {
     uv = 2.0*uv-1.0;
+	edge = max(edge, 1.0e-8);
     float angle = atan(uv.x, uv.y);
     float slice = 6.28318530718/sides;
-    return clamp((radius-cos(floor(1.5+angle/slice-2.0*step(0.5*slice, mod(angle, slice)))*slice-angle)*length(uv))/(edge*radius), 0.0, 1.0);
+    return clamp((size-cos(floor(1.5+angle/slice-2.0*step(0.5*slice, mod(angle, slice)))*slice-angle)*length(uv))/(edge*size), 0.0, 1.0);
 }
 
-float curved_star(vec2 uv, float sides, float radius, float edge) {
+float curved_star(vec2 uv, float sides, float size, float edge) {
     uv = 2.0*uv-1.0;
+	edge = max(edge, 1.0e-8);
     float angle = 2.0*(atan(uv.x, uv.y)+3.14159265359);
     float slice = 6.28318530718/sides;
-    return clamp((radius-cos(floor(0.5+0.5*angle/slice)*2.0*slice-angle)*length(uv))/(edge*radius), 0.0, 1.0);
+    return clamp((size-cos(floor(0.5+0.5*angle/slice)*2.0*slice-angle)*length(uv))/(edge*size), 0.0, 1.0);
+}
+
+float rays(vec2 uv, float sides, float size, float edge) {
+    uv = 2.0*uv-1.0;
+	edge = 0.5*max(edge, 1.0e-8)*size;
+	float slice = 6.28318530718/sides;
+    float angle = mod(atan(uv.x, uv.y)+3.14159265359, slice)/slice;
+    return clamp(min((size-angle)/edge, angle/edge), 0.0, 1.0);
 }
 
 float wave_constant(float x) {
diff --git a/addons/material_maker/examples/radiation.ptex b/addons/material_maker/examples/radiation.ptex
new file mode 100644
index 00000000..dad585b7
--- /dev/null
+++ b/addons/material_maker/examples/radiation.ptex
@@ -0,0 +1 @@
+{"connections":[{"from":"shape_0","from_port":0,"to":"blend_0","to_port":1},{"from":"blend_1","from_port":0,"to":"blend_0","to_port":0},{"from":"shape_2","from_port":0,"to":"blend_1","to_port":0},{"from":"shape_1","from_port":0,"to":"blend_1","to_port":1},{"from":"blend_0","from_port":0,"to":"blend_2","to_port":0},{"from":"shape_3","from_port":0,"to":"blend_2","to_port":1},{"from":"blend_2","from_port":0,"to":"colorize_0","to_port":0},{"from":"colorize_0","from_port":0,"to":"Material","to_port":0}],"nodes":[{"edge":0.05,"name":"shape_3","node_position":{"x":-35,"y":36},"radius":0.18,"shape":0,"sides":3,"type":"shape"},{"edge":0.02,"name":"shape_0","node_position":{"x":-373,"y":13},"radius":0.5,"shape":4,"sides":3,"type":"shape"},{"edge":0.02,"name":"shape_1","node_position":{"x":-359,"y":-99},"radius":0.87,"shape":0,"sides":3,"type":"shape"},{"edge":0.02,"name":"shape_2","node_position":{"x":-358,"y":-200},"radius":0.34,"shape":0,"sides":3,"type":"shape"},{"amount":1,"blend_type":11,"name":"blend_1","node_position":{"x":-236,"y":-159},"type":"blend"},{"amount":1,"blend_type":2,"name":"blend_0","node_position":{"x":-53,"y":-74},"type":"blend"},{"amount":1,"blend_type":3,"name":"blend_2","node_position":{"x":148,"y":-34},"type":"blend"},{"gradient":{"points":[{"b":0,"g":0.820313,"pos":0,"r":0.9375},{"b":0,"g":0,"pos":1,"r":0}],"type":"Gradient"},"name":"colorize_0","node_position":{"x":354.081177,"y":-39.5},"type":"colorize"},{"albedo_color":{"a":1,"b":1,"g":1,"r":1,"type":"Color"},"ao_light_affect":1,"depth_scale":1,"emission_energy":1,"metallic":1,"name":"Material","node_position":{"x":528,"y":-57},"normal_scale":1,"resolution":1,"roughness":1,"type":"material"}]}
\ No newline at end of file
diff --git a/addons/material_maker/main_window.tscn b/addons/material_maker/main_window.tscn
index 5ae8cf63..43850a87 100644
--- a/addons/material_maker/main_window.tscn
+++ b/addons/material_maker/main_window.tscn
@@ -6,7 +6,7 @@
 [ext_resource path="res://addons/material_maker/widgets/tabs.gd" type="Script" id=4]
 [ext_resource path="res://addons/material_maker/renderer.tscn" type="PackedScene" id=5]
 
-[node name="MainWindow" type="Panel" index="0"]
+[node name="MainWindow" type="Panel"]
 
 anchor_left = 0.0
 anchor_top = 0.0
diff --git a/addons/material_maker/nodes/shape.gd b/addons/material_maker/nodes/shape.gd
index 8350f473..6c3d01b2 100644
--- a/addons/material_maker/nodes/shape.gd
+++ b/addons/material_maker/nodes/shape.gd
@@ -6,7 +6,7 @@ var sides
 var radius
 var edge
 
-const SHAPES = [ "circle", "polygon", "star", "curved_star" ]
+const SHAPES = [ "circle", "polygon", "star", "curved_star", "rays" ]
 
 func _ready():
 	initialize_properties([ $shape, $sides, $radius, $edge ])
diff --git a/addons/material_maker/nodes/shape.tscn b/addons/material_maker/nodes/shape.tscn
index 75f202b8..5e802450 100644
--- a/addons/material_maker/nodes/shape.tscn
+++ b/addons/material_maker/nodes/shape.tscn
@@ -81,7 +81,7 @@ group = null
 text = "Circle"
 flat = false
 align = 0
-items = [ "Circle", null, false, 0, null, "Polygon", null, false, 1, null, "Star", null, false, 2, null, "Curved star", null, false, 3, null ]
+items = [ "Circle", null, false, 0, null, "Polygon", null, false, 1, null, "Star", null, false, 2, null, "Curved star", null, false, 3, null, "Rays", null, false, 4, null ]
 selected = 0
 
 [node name="sides" type="HSlider" parent="." index="1"]
@@ -102,7 +102,7 @@ mouse_filter = 0
 mouse_default_cursor_shape = 0
 size_flags_horizontal = 1
 size_flags_vertical = 0
-min_value = 3.0
+min_value = 1.0
 max_value = 16.0
 step = 1.0
 page = 0.0