Fix

Projekte/mdga/client/src/main/resources/MatDefs/SelectObjectOutliner/Post15.vert

@@ -1,10 +1,15 @@
-attribute vec4 inPosition;
-attribute vec2 inTexCoord;
+// Use 'in' for vertex attributes
+in vec4 inPosition;
+in vec2 inTexCoord;
 
-varying vec2 texCoord;
+// Use 'out' for passing data to the fragment shader
+out vec2 texCoord;
 
 void main() {
+    // Transform position to clip space
     vec2 pos = inPosition.xy * 2.0 - 1.0;
     gl_Position = vec4(pos, 0.0, 1.0);
+
+    // Pass texture coordinates to the fragment shader
     texCoord = inTexCoord;
-}
+}