diff --git a/Shaders/painter/glsl/layer_view.frag.glsl b/Shaders/painter/glsl/layer_view.frag.glsl
index fb5ca02a..5d3fdd19 100644
--- a/Shaders/painter/glsl/layer_view.frag.glsl
+++ b/Shaders/painter/glsl/layer_view.frag.glsl
@@ -1,8 +1,23 @@
 #version 330
 uniform sampler2D tex;
+uniform int channel;
 in vec2 texCoord;
 in vec4 color;
 out vec4 FragColor;
 void main() {
-	FragColor = textureLod(tex, texCoord, 0) * color;
+	if (channel == 1) {
+		FragColor = textureLod(tex, texCoord, 0).rrra * color;
+	}
+	else if (channel == 2) {
+		FragColor = textureLod(tex, texCoord, 0).ggga * color;
+	}
+	else if (channel == 3) {
+		FragColor = textureLod(tex, texCoord, 0).bbba * color;
+	}
+	else if (channel == 4) {
+		FragColor = textureLod(tex, texCoord, 0).aaaa * color;
+	}
+	else {
+		FragColor = textureLod(tex, texCoord, 0).rgba * color;
+	}
 }
diff --git a/Shaders/painter/hlsl/layer_merge.vert.glsl b/Shaders/painter/hlsl/layer_merge.vert.glsl
index 64937e0e..38cf0b8f 100644
Binary files a/Shaders/painter/hlsl/layer_merge.vert.glsl and b/Shaders/painter/hlsl/layer_merge.vert.glsl differ
diff --git a/Shaders/painter/hlsl/layer_view.frag.glsl b/Shaders/painter/hlsl/layer_view.frag.glsl
index e732fbcf..8ec76148 100644
Binary files a/Shaders/painter/hlsl/layer_view.frag.glsl and b/Shaders/painter/hlsl/layer_view.frag.glsl differ
diff --git a/Shaders/painter/hlsl/src/build.bat b/Shaders/painter/hlsl/src/build.bat
new file mode 100644
index 00000000..cbc8dd4c
--- /dev/null
+++ b/Shaders/painter/hlsl/src/build.bat
@@ -0,0 +1,7 @@
+..\..\..\bin\hlslbin.exe cursor.vert.hlsl ..\cursor.vert.glsl vs_5_0 -i nor -i pos -i tex
+..\..\..\bin\hlslbin.exe cursor.frag.hlsl ..\cursor.frag.glsl ps_5_0
+..\..\..\bin\hlslbin.exe layer_view.vert.hlsl ..\layer_view.vert.glsl vs_5_0 -i col -i pos -i tex
+..\..\..\bin\hlslbin.exe layer_view.frag.hlsl ..\layer_view.frag.glsl ps_5_0
+..\..\..\bin\hlslbin.exe layer_merge.vert.hlsl ..\layer_merge.vert.glsl vs_5_0 -i col -i pos -i tex
+..\..\..\bin\hlslbin.exe layer_merge.frag.hlsl ..\layer_merge.frag.glsl ps_5_0
+..\..\..\bin\hlslbin.exe mask_merge.frag.hlsl ..\mask_merge.frag.glsl ps_5_0
diff --git a/Shaders/painter/hlsl/src/layer_view.frag.hlsl b/Shaders/painter/hlsl/src/layer_view.frag.hlsl
index efc657af..67b90127 100644
--- a/Shaders/painter/hlsl/src/layer_view.frag.hlsl
+++ b/Shaders/painter/hlsl/src/layer_view.frag.hlsl
@@ -1,5 +1,20 @@
 Texture2D<float4> tex;
 SamplerState _tex_sampler;
+uniform int channel;
 float4 main(float4 color : TEXCOORD0, float2 texCoord : TEXCOORD1) : SV_Target0 {
-	return tex.SampleLevel(_tex_sampler, texCoord, 0) * color;
+	if (channel == 1) {
+		return tex.SampleLevel(_tex_sampler, texCoord, 0).rrra * color;
+	}
+	else if (channel == 2) {
+		return tex.SampleLevel(_tex_sampler, texCoord, 0).ggga * color;
+	}
+	else if (channel == 3) {
+		return tex.SampleLevel(_tex_sampler, texCoord, 0).bbba * color;
+	}
+	else if (channel == 4) {
+		return tex.SampleLevel(_tex_sampler, texCoord, 0).aaaa * color;
+	}
+	else {
+		return tex.SampleLevel(_tex_sampler, texCoord, 0).rgba * color;
+	}
 }
diff --git a/Shaders/raytrace/raytrace_bake_ao.cso b/Shaders/raytrace/raytrace_bake_ao.cso
index 6ec8ae1c..89859ae8 100644
Binary files a/Shaders/raytrace/raytrace_bake_ao.cso and b/Shaders/raytrace/raytrace_bake_ao.cso differ
diff --git a/Shaders/raytrace/raytrace_bake_bent.cso b/Shaders/raytrace/raytrace_bake_bent.cso
index c3490738..3e92e65c 100644
Binary files a/Shaders/raytrace/raytrace_bake_bent.cso and b/Shaders/raytrace/raytrace_bake_bent.cso differ
diff --git a/Shaders/raytrace/raytrace_bake_light.cso b/Shaders/raytrace/raytrace_bake_light.cso
index ab055dfb..5febbfa8 100644
Binary files a/Shaders/raytrace/raytrace_bake_light.cso and b/Shaders/raytrace/raytrace_bake_light.cso differ
diff --git a/Shaders/raytrace/raytrace_bake_thick.cso b/Shaders/raytrace/raytrace_bake_thick.cso
index 89e335f5..4506f3b9 100644
Binary files a/Shaders/raytrace/raytrace_bake_thick.cso and b/Shaders/raytrace/raytrace_bake_thick.cso differ
diff --git a/Shaders/raytrace/src/raytrace_bake_ao.hlsl b/Shaders/raytrace/src/raytrace_bake_ao.hlsl
index 2493a772..51b68df0 100644
--- a/Shaders/raytrace/src/raytrace_bake_ao.hlsl
+++ b/Shaders/raytrace/src/raytrace_bake_ao.hlsl
@@ -77,7 +77,7 @@ void raygeneration() {
 		float b = 1.0 - a;
 		color = color * b + accum.xyz * a;
 	}
-	render_target[DispatchRaysIndex().xy] = float4(color.xyz, 0.0f);
+	render_target[DispatchRaysIndex().xy] = float4(color.xyz, 1.0f);
 }
 
 [shader("closesthit")]
diff --git a/Shaders/raytrace/src/raytrace_bake_bent.hlsl b/Shaders/raytrace/src/raytrace_bake_bent.hlsl
index 0e338b7d..991f9a63 100644
--- a/Shaders/raytrace/src/raytrace_bake_bent.hlsl
+++ b/Shaders/raytrace/src/raytrace_bake_bent.hlsl
@@ -79,7 +79,7 @@ void raygeneration() {
 		float b = 1.0 - a;
 		color = color * b + accum.xyz * a;
 	}
-	render_target[DispatchRaysIndex().xy] = float4(color.xyz, 0.0f);
+	render_target[DispatchRaysIndex().xy] = float4(color.xyz, 1.0f);
 }
 
 [shader("closesthit")]
diff --git a/Shaders/raytrace/src/raytrace_bake_light.hlsl b/Shaders/raytrace/src/raytrace_bake_light.hlsl
index d25a8e6a..51899f89 100644
--- a/Shaders/raytrace/src/raytrace_bake_light.hlsl
+++ b/Shaders/raytrace/src/raytrace_bake_light.hlsl
@@ -81,7 +81,7 @@ void raygeneration() {
 		float b = 1.0 - a;
 		color = color * b + accum.xyz * a;
 	}
-	render_target[DispatchRaysIndex().xy] = float4(color.xyz, 0.0f);
+	render_target[DispatchRaysIndex().xy] = float4(color.xyz, 1.0f);
 }
 
 [shader("closesthit")]
diff --git a/Shaders/raytrace/src/raytrace_bake_thick.hlsl b/Shaders/raytrace/src/raytrace_bake_thick.hlsl
index c72899f1..1596104d 100644
--- a/Shaders/raytrace/src/raytrace_bake_thick.hlsl
+++ b/Shaders/raytrace/src/raytrace_bake_thick.hlsl
@@ -78,7 +78,7 @@ void raygeneration() {
 		float b = 1.0 - a;
 		color = color * b + accum.xyz * a;
 	}
-	render_target[DispatchRaysIndex().xy] = float4(color.xyz, 0.0f);
+	render_target[DispatchRaysIndex().xy] = float4(color.xyz, 1.0f);
 }
 
 [shader("closesthit")]
diff --git a/Sources/arm/Tool.hx b/Sources/arm/Tool.hx
index 4ac679dc..b4f5e181 100644
--- a/Sources/arm/Tool.hx
+++ b/Sources/arm/Tool.hx
@@ -191,7 +191,9 @@ package arm;
 @:enum abstract PaintTex(Int) from Int to Int {
 	var TexBase = 0;
 	var TexNormal = 1;
-	var TexPack = 2;
+	var TexOcclusion = 2;
+	var TexRoughness = 3;
+	var TexMetallic = 4;
 }
 
 @:enum abstract ProjectModel(Int) from Int to Int {
diff --git a/Sources/arm/ui/UIView2D.hx b/Sources/arm/ui/UIView2D.hx
index 752584ab..b7f9df2f 100644
--- a/Sources/arm/ui/UIView2D.hx
+++ b/Sources/arm/ui/UIView2D.hx
@@ -6,6 +6,7 @@ import kha.graphics4.PipelineState;
 import kha.graphics4.VertexStructure;
 import kha.graphics4.VertexData;
 import kha.graphics4.BlendingFactor;
+import kha.graphics4.ConstantLocation;
 import zui.Zui;
 import zui.Id;
 import iron.system.Input;
@@ -28,6 +29,7 @@ class UIView2D {
 	public var panY = 0.0;
 	public var panScale = 1.0;
 	var pipe: PipelineState;
+	var channelLocation: ConstantLocation;
 	var texType = TexBase;
 	var uvmapShow = false;
 
@@ -46,6 +48,7 @@ class UIView2D {
 		pipe.blendDestination = BlendingFactor.BlendZero;
 		pipe.colorWriteMaskAlpha = false;
 		pipe.compile();
+		channelLocation = pipe.getConstantLocation("channel");
 
 		var scale = Config.raw.window_scale;
 		ui = new Zui({font: App.font, theme: App.theme, color_wheel: App.color_wheel, scaleFactor: scale});
@@ -94,22 +97,36 @@ class UIView2D {
 			ui.g.pipeline = pipe;
 			var l = Context.layer;
 			var tex: Image = null;
+			var channel = 0;
 
 			if (type == View2DLayer) {
-				tex = texType == TexBase ? l.texpaint : texType == TexNormal ? l.texpaint_nor : l.texpaint_pack;
-				if (Context.layerIsMask) tex = l.texpaint_mask;
+				tex =
+					Context.layerIsMask     ? l.texpaint_mask :
+					texType == TexBase      ? l.texpaint :
+					texType == TexNormal    ? l.texpaint_nor :
+										      l.texpaint_pack;
+
+				channel =
+					texType == TexOcclusion ? 1 :
+					texType == TexRoughness ? 2 :
+					texType == TexMetallic  ? 3 :
+											  0;
 			}
 			else { // View2DAsset
 				tex = UITrait.inst.getImage(Context.texture);
 			}
 
+			ui.currentWindow.texture.g4.setInt(channelLocation, channel);
+
 			var th = tw;
 			if (tex != null) {
 				th = tw * (tex.height / tex.width);
 				if (!UITrait.inst.textureFilter) {
 					ui.g.imageScaleQuality = kha.graphics2.ImageScaleQuality.Low;
 				}
+
 				ui.g.drawScaledImage(tex, tx, ty, tw, th);
+
 				if (!UITrait.inst.textureFilter) {
 					ui.g.imageScaleQuality = kha.graphics2.ImageScaleQuality.High;
 				}
@@ -165,7 +182,7 @@ class UIView2D {
 				ui._x = 2;
 				ui._y = 2;
 				ui._w = ew;
-				texType = ui.combo(Id.handle({position: texType}), ["Base", "Normal Map", "ORM"], "Texture");
+				texType = ui.combo(Id.handle({position: texType}), ["Base Color", "Normal Map", "Occlusion", "Roughness", "Metallic"], "Texture");
 				ui._x += ew + 3;
 				ui._y = 2;
 				uvmapShow = ui.check(Id.handle({selected: uvmapShow}), "UV Map");