explosion effect is looking nice

assets/shaders/mask.fs

@@ -5,11 +5,13 @@ precision mediump float;
 // Input vertex attributes (from vertex shader)
 varying vec3 fragPosition;
 
+uniform float alpha;
+
 void main() {
     // Texel color fetching from texture sampler
 
     // NOTE: Implement here your fragment shader code
 
-    gl_FragColor = vec4(fragPosition, 1.0);
+    gl_FragColor = vec4(fragPosition, alpha);
 
 }