diff --git a/app-proto/inversive-display/src/inversive.frag b/app-proto/inversive-display/src/inversive.frag
index 2e185a5..93bec50 100644
--- a/app-proto/inversive-display/src/inversive.frag
+++ b/app-proto/inversive-display/src/inversive.frag
@@ -11,16 +11,6 @@ struct vecInv {
     vec2 lt;
 };
 
-vecInv sphere(vec3 center, float radius) {
-    return vecInv(
-        center / radius,
-        vec2(
-            0.5 / radius,
-            0.5 * (dot(center, center) / radius - radius)
-        )
-    );
-}
-
 // --- uniforms ---
 
 // construction. the SPHERE_MAX array size seems to affect frame rate a lot,
@@ -35,8 +25,6 @@ uniform vec2 resolution;
 uniform float shortdim;
 
 // controls
-uniform vec2 ctrl;
-uniform vec2 radius;
 uniform float opacity;
 uniform float highlight;
 uniform int layer_threshold;
diff --git a/app-proto/inversive-display/src/main.rs b/app-proto/inversive-display/src/main.rs
index d351149..8d16732 100644
--- a/app-proto/inversive-display/src/main.rs
+++ b/app-proto/inversive-display/src/main.rs
@@ -7,7 +7,6 @@
 //   https://stackoverflow.com/a/39684775
 //
 
-extern crate js_sys;
 use core::array;
 use nalgebra::{DMatrix, DVector, Rotation3, Vector3};
 use sycamore::{prelude::*, motion::create_raf, rt::{JsCast, JsValue}};
@@ -343,8 +342,6 @@ fn main() {
             );
             let resolution_loc = ctx.get_uniform_location(&program, "resolution");
             let shortdim_loc = ctx.get_uniform_location(&program, "shortdim");
-            let ctrl_loc = ctx.get_uniform_location(&program, "ctrl"); /* DEBUG */
-            let radius_loc = ctx.get_uniform_location(&program, "radius"); /* DEBUG */
             let opacity_loc = ctx.get_uniform_location(&program, "opacity");
             let highlight_loc = ctx.get_uniform_location(&program, "highlight");
             let layer_threshold_loc = ctx.get_uniform_location(&program, "layer_threshold");
@@ -483,8 +480,6 @@ fn main() {
                     }
                     
                     // pass the control parameters
-                    ctx.uniform2f(ctrl_loc.as_ref(), ctrl_x.get() as f32, ctrl_y.get() as f32); /* DEBUG */
-                    ctx.uniform2f(radius_loc.as_ref(), radius_x.get() as f32, radius_y.get() as f32); /* DEBUG */
                     ctx.uniform1f(opacity_loc.as_ref(), opacity.get() as f32);
                     ctx.uniform1f(highlight_loc.as_ref(), highlight.get() as f32);
                     ctx.uniform1i(layer_threshold_loc.as_ref(), layer_threshold.get() as i32);