diff --git a/paint/sources/box_preferences.ts b/paint/sources/box_preferences.ts
index ccf9accf..745d25e5 100644
--- a/paint/sources/box_preferences.ts
+++ b/paint/sources/box_preferences.ts
@@ -473,6 +473,15 @@ function box_preferences_usage_tab() {
 		make_material_parse_paint_material();
 	}
 	ui.enabled = true;
+
+	let alpha_discard_handle: ui_handle_t = ui_handle(__ID__);
+	if (alpha_discard_handle.init) {
+		alpha_discard_handle.f = config_raw.brush_alpha_discard;
+	}
+	config_raw.brush_alpha_discard = ui_slider(alpha_discard_handle, tr("Alpha Discard"), 0.0, 1.0, true);
+	if (alpha_discard_handle.changed) {
+		make_material_parse_paint_material();
+	}
 }
 
 function box_preferences_pen_tab() {
diff --git a/paint/sources/config.ts b/paint/sources/config.ts
index a94a60aa..7cf997f7 100644
--- a/paint/sources/config.ts
+++ b/paint/sources/config.ts
@@ -94,6 +94,7 @@ function config_save() {
 	json_encode_bool("material_live", config_raw.material_live);
 	json_encode_bool("brush_depth_reject", config_raw.brush_depth_reject);
 	json_encode_bool("brush_angle_reject", config_raw.brush_angle_reject);
+	json_encode_f32("brush_alpha_discard", config_raw.brush_alpha_discard);
 	json_encode_i32("dilate_radius", config_raw.dilate_radius);
 	json_encode_string("blender", config_raw.blender);
 	json_encode_i32("scene_atlas_res", config_raw.scene_atlas_res);
@@ -195,17 +196,18 @@ function config_init() {
 		/// else
 		config_raw.material_live = true;
 		/// end
-		config_raw.brush_depth_reject = true;
-		config_raw.brush_angle_reject = true;
-		config_raw.brush_live         = false;
-		config_raw.show_asset_names   = false;
-		config_raw.dilate_radius      = 2;
-		config_raw.blender            = "";
-		config_raw.scene_atlas_res    = texture_res_t.RES8192;
-		config_raw.pathtrace_mode     = pathtrace_mode_t.FAST;
-		config_raw.grid_snap          = false;
-		config_raw.experimental       = false;
-		config_raw.neural_backend     = neural_backend_t.VULKAN;
+		config_raw.brush_depth_reject  = true;
+		config_raw.brush_angle_reject  = true;
+		config_raw.brush_alpha_discard = 0.1;
+		config_raw.brush_live          = false;
+		config_raw.show_asset_names    = false;
+		config_raw.dilate_radius       = 2;
+		config_raw.blender             = "";
+		config_raw.scene_atlas_res     = texture_res_t.RES8192;
+		config_raw.pathtrace_mode      = pathtrace_mode_t.FAST;
+		config_raw.grid_snap           = false;
+		config_raw.experimental        = false;
+		config_raw.neural_backend      = neural_backend_t.VULKAN;
 	}
 	else {
 		// Discard old config
@@ -470,6 +472,7 @@ type config_t = {
 	material_live?: bool;
 	brush_depth_reject?: bool;
 	brush_angle_reject?: bool;
+	brush_alpha_discard?: f32;
 	dilate_radius?: i32;
 	blender?: string;
 	scene_atlas_res?: i32;
diff --git a/paint/sources/make_mesh_preview.ts b/paint/sources/make_mesh_preview.ts
index e1e9742a..874b95a2 100644
--- a/paint/sources/make_mesh_preview.ts
+++ b/paint/sources/make_mesh_preview.ts
@@ -1,6 +1,4 @@
 
-let make_mesh_preview_opacity_discard_decal: f32 = 0.05;
-
 function make_mesh_preview_run(data: material_t, matcon: material_context_t): node_shader_context_t {
 	let context_id: string      = "mesh";
 	let props: shader_context_t = {
@@ -58,8 +56,8 @@ function make_mesh_preview_run(data: material_t, matcon: material_context_t): no
 		}
 	}
 	if (decal) {
-		let opac: f32 = make_mesh_preview_opacity_discard_decal;
-		node_shader_write_frag(kong, "if (opacity < " + opac + ") { discard; }");
+		let opac: f32 = config_raw.brush_alpha_discard;
+		node_shader_write_frag(kong, "if (opacity <= float(" + opac + ")) { discard; }");
 	}
 
 	kong.frag_out = "float4[2]";
diff --git a/paint/sources/make_paint.ts b/paint/sources/make_paint.ts
index a01f4f81..b8ac2c70 100644
--- a/paint/sources/make_paint.ts
+++ b/paint/sources/make_paint.ts
@@ -336,7 +336,7 @@ function make_paint_run(data: material_t, matcon: material_context_t): node_shad
 		}
 	}
 
-	node_shader_write_frag(kong, "if (opacity == 0.0) { discard; }");
+	node_shader_write_frag(kong, "if (opacity <= float(" + config_raw.brush_alpha_discard + ")) { discard; }");
 
 	if (context_raw.tool == tool_type_t.PARTICLE) { // Particle mask
 		make_particle_mask(kong);
@@ -356,7 +356,7 @@ function make_paint_run(data: material_t, matcon: material_context_t): node_shad
 	node_shader_add_texture(kong, "paintmask");
 	node_shader_write_frag(kong, "var sample_mask: float = sample_lod(paintmask, sampler_linear, sample_tc, 0.0).r;");
 	node_shader_write_frag(kong, "str = max(str, sample_mask);");
-	// write(frag, "str = clamp(str + sample_mask, 0.0, 1.0);");
+	// node_shader_write_frag(kong, "str = clamp(str + sample_mask, 0.0, 1.0);");
 
 	node_shader_add_texture(kong, "texpaint_undo", "_texpaint_undo");
 	node_shader_write_frag(kong, "var sample_undo: float4 = sample_lod(texpaint_undo, sampler_linear, sample_tc, 0.0);");