diff --git a/libraries/render-utils/src/lightClusters_drawGrid.slv b/libraries/render-utils/src/lightClusters_drawGrid.slv
index db7006322c..4c32be6d5c 100644
--- a/libraries/render-utils/src/lightClusters_drawGrid.slv
+++ b/libraries/render-utils/src/lightClusters_drawGrid.slv
@@ -33,6 +33,18 @@ uniform frustrumGridBuffer {
     FrustrumGrid frustrumGrid;
 };
 
+float getProjectionNear(mat4 projection) {
+    float planeC = projection[2][3] + projection[2][2];
+    float planeD = projection[3][2];
+    return planeD / planeC;
+}
+float getProjectionFar(mat4 projection) {
+    //float planeA = projection[0][3] - projection[0][2];
+    //float planeB = projection[1][3] - projection[1][2];
+    float planeC = projection[2][3] - projection[2][2];
+    float planeD = /*projection[3][3]*/ - projection[3][2];
+    return planeD / planeC;
+}
 //uniform ivec4 inClusterLocation;
 
 out vec4 varColor;
@@ -66,14 +78,24 @@ void main(void) {
     vec4 pos = UNIT_BOX[UNIT_BOX_LINE_INDICES[gl_VertexID]];
 
   //  pos.z -= 10.0f;
+    vec3 cpos = vec3(1, 0, 1);
 
+   // float z = frustrumGrid.nearFarRange.y * (1 - pos.z) + frustrumGrid.nearFarRange.z * (pos.z);
+    vec3 gridScale = vec3(0.5, 0.5, 1.0) / vec3(frustrumGrid.dims.xyz);
 
-    vec4 eyePos = frustrumGrid.eyeToGridProjInv * (pos);
+    vec3 cvpos = cpos + pos.xyz;
+
+    vec3 clusterStart = vec3(-1.0 + cvpos.x * gridScale.x, -1.0 + cvpos.y * gridScale.y, cvpos.z * gridScale.z);
+
+    float z = getProjectionNear(frustrumGrid.eyeToGridProj) * (1 - clusterStart.z) + getProjectionFar(frustrumGrid.eyeToGridProj) * (clusterStart.z);
+
+    vec4 eyePos = frustrumGrid.eyeToGridProjInv * (vec4(clusterStart.xy, 1.0, 1.0) * z);
 
     eyePos.xyz *= eyePos.w;
 
     vec4 worldPos = frustrumGrid.eyeToWorldMat * vec4(eyePos.xyz, 1.0);
 
+
     /*
     int cellIsEmpty = sign(inClusterLocation.w);
     ivec4 cellLocation = ivec4(inClusterLocation.xyz, (inClusterLocation.w < 0 ? -inClusterLocation.w : inClusterLocation.w));