Atlas margin setting support

src/features/editScene/components/ProceduralTexture.hpp

@@ -43,6 +43,10 @@ struct ProceduralTextureComponent {
     // Texture size (default 512x512)
     int textureSize = 512;
     
+    // UV margin for texture mapping (default 0.01, range 0.01-0.025)
+    // Used to prevent color bleeding by adding padding around UV coordinates
+    float uvMargin = 0.01f;
+    
     // Whether the texture needs regeneration
     bool dirty = true;
     

src/features/editScene/systems/CellGridSystem.cpp

@@ -2480,8 +2480,8 @@ void CellGridSystem::buildDistrictPlaza(flecs::entity entity,
 			const TextureRectInfo *rect =
 				texture.getNamedRect(district.textureRectName);
 			if (rect) {
-				// Apply UV mapping with 0.01 margin
-				const float margin = 0.01f;
+				// Apply UV mapping with configurable margin
+				const float margin = texture.uvMargin;
 				float uRange = (rect->u2 - rect->u1) *
 					       (1.0f - 2.0f * margin);
 				float vRange = (rect->v2 - rect->v1) *
@@ -2851,7 +2851,8 @@ void CellGridSystem::buildLotBase(flecs::entity entity, LotComponent &lot)
 			const TextureRectInfo *rect =
 				texture.getNamedRect(textureRectToUse);
 			if (rect) {
-				const float margin = 0.01f;
+				// Apply UV mapping with configurable margin
+				const float margin = texture.uvMargin;
 				float uRange = (rect->u2 - rect->u1) *
 					       (1.0f - 2.0f * margin);
 				float vRange = (rect->v2 - rect->v1) *
@@ -3046,8 +3047,8 @@ void CellGridSystem::applyUVMappingToBuffer(Procedural::TriangleBuffer &tb,
 		std::to_string(rect->u2) + " v=" + std::to_string(rect->v1) +
 		"-" + std::to_string(rect->v2));
 
-	// Apply texture rectangle UV mapping
-	const float margin = 0.01f;
+	// Apply texture rectangle UV mapping with configurable margin
+	const float margin = texture.uvMargin;
 	float uRange = (rect->u2 - rect->u1) * (1.0f - 2.0f * margin);
 	float vRange = (rect->v2 - rect->v1) * (1.0f - 2.0f * margin);
 	float uOffset = rect->u1 + (rect->u2 - rect->u1) * margin;

src/features/editScene/systems/ProceduralMeshSystem.cpp

@@ -204,8 +204,8 @@ void ProceduralMeshSystem::applyUVMapping(Procedural::TriangleBuffer* buffer,
     const TextureRectInfo* rect = texture.getNamedRect(rectName);
     if (!rect) return;
     
-    // Calculate UV mapping with margin
-    const float margin = 0.01f;
+    // Calculate UV mapping with configurable margin
+    const float margin = texture.uvMargin;
     float uRange = (rect->u2 - rect->u1) * (1.0f - 2.0f * margin);
     float vRange = (rect->v2 - rect->v1) * (1.0f - 2.0f * margin);
     float uOffset = rect->u1 + (rect->u2 - rect->u1) * margin;

src/features/editScene/systems/SceneSerializer.cpp

@@ -1043,6 +1043,7 @@ nlohmann::json SceneSerializer::serializeProceduralTexture(flecs::entity entity)
 	
 	json["textureName"] = texture.textureName;
 	json["textureSize"] = texture.textureSize;
+	json["uvMargin"] = texture.uvMargin;
 	
 	// Serialize colors array
 	nlohmann::json colorsJson = nlohmann::json::array();
@@ -1079,6 +1080,7 @@ void SceneSerializer::deserializeProceduralTexture(flecs::entity entity, const n
 	
 	texture.textureName = json.value("textureName", "");
 	texture.textureSize = json.value("textureSize", 512);
+	texture.uvMargin = json.value("uvMargin", 0.01f);
 	
 	// Deserialize colors array
 	if (json.contains("colors") && json["colors"].is_array()) {

src/features/editScene/ui/ProceduralTextureEditor.cpp

@@ -252,6 +252,19 @@ bool ProceduralTextureEditor::renderComponent(flecs::entity entity, ProceduralTe
 			modified = true;
 		}
 		
+		// UV Margin control to prevent color bleeding
+		ImGui::Separator();
+		ImGui::Text("UV Margin (prevents color bleeding):");
+		if (ImGui::DragFloat("Margin", &texture.uvMargin, 0.001f, 0.01f, 0.025f, "%.3f")) {
+			// Clamp to valid range
+			if (texture.uvMargin < 0.01f) texture.uvMargin = 0.01f;
+			if (texture.uvMargin > 0.025f) texture.uvMargin = 0.025f;
+			texture.markDirty();
+			modified = true;
+		}
+		ImGui::TextDisabled("Default: 0.010, Range: 0.010-0.025, Step: 0.001");
+		ImGui::TextDisabled("Higher values = more padding, less color bleeding");
+		
 		ImGui::Separator();
 		
 		// Color grid

src/features/editScene/ui/TriangleBufferEditor.cpp

@@ -235,7 +235,7 @@ bool TriangleBufferEditor::renderComponent(flecs::entity entity, TriangleBufferC
 		ImGui::Text("Texture Mapping:");
 		renderTextureSelector(entity, tb);
 		renderRectSelector(entity, tb);
-		ImGui::TextDisabled("UVs will be mapped to rectangle with 0.01 margin");
+		ImGui::TextDisabled("UVs will be mapped to rectangle with margin from texture");
 		
 		ImGui::Separator();