diff --git a/app-proto/inversive-display/src/inversive.frag b/app-proto/inversive-display/src/inversive.frag
index 51bc0ff..ce6deae 100644
--- a/app-proto/inversive-display/src/inversive.frag
+++ b/app-proto/inversive-display/src/inversive.frag
@@ -25,10 +25,10 @@ vecInv sphere(vec3 center, float radius) {
 
 // construction. the SPHERE_MAX array size seems to affect frame rate a lot,
 // even though we should only be using the first few elements of each array
-const int SPHERE_MAX = 12;
+const int SPHERE_MAX_UNIFORM = 12;
 uniform int sphere_cnt;
-uniform vecInv sphere_list[SPHERE_MAX];
-uniform vec3 color_list[SPHERE_MAX];
+uniform vecInv sphere_list[SPHERE_MAX_UNIFORM];
+uniform vec3 color_list[SPHERE_MAX_UNIFORM];
 
 // view
 uniform vec2 resolution;
@@ -135,8 +135,9 @@ void main() {
     vec3 dir = vec3(focal_slope * scr, -1.);
     
     // cast rays through the spheres
-    vec2 depth_pairs [SPHERE_MAX];
-    taggedFrag frags [2*SPHERE_MAX];
+    const int SPHERE_MAX_INTERNAL = 6;
+    vec2 depth_pairs [SPHERE_MAX_INTERNAL];
+    taggedFrag frags [2*SPHERE_MAX_INTERNAL];
     int frag_cnt = 0;
     for (int i = 0; i < sphere_cnt; ++i) {
         vec2 hit_depths = sphere_cast(sphere_list[i], dir);