2. #define PROCESSING_COLOR_SHADER
3. 
   
4. uniform mat4 transform;
5. 
   
6. attribute vec4 vertex;
7. attribute vec4 color;
8. 
   
9. attribute float junk;
10. 
    
11. varying vec4 vertColor;
12. 
    
13. void main() {
14.   float junk1 = junk;
15.   vertColor = color;
16.   gl_Position = transform * vertex;
17. }

2. #ifdef GL_ES
3. precision mediump float;
4. precision mediump int;
5. #endif
6. 
   
7. varying vec4 vertColor;
8. 
   
9. void main() {
10.   gl_FragColor = vertColor;
11. }

junk attribute in the vertice shader will render a single pixel in the middle of my rendering. If i rename it to unused it works fine. If i completely remove it I get a single pixel again. As you can see there is zero dependency on this attribute in my program. Am i missing something??