type fixes

src/mol-math/geometry/common.ts

@@ -14,11 +14,12 @@ export interface PositionData {
     x: ArrayLike<number>,
     y: ArrayLike<number>,
     z: ArrayLike<number>,
-    id: ArrayLike<number>,
     /** subset of indices into the x/y/z/radius arrays */
     indices: OrderedSet,
     /** optional element radius */
-    radius?: ArrayLike<number>
+    radius?: ArrayLike<number>,
+    /** optional element id */
+    id?: ArrayLike<number>,
 }
 
 export type DensityData = {

src/mol-math/geometry/gaussian-density/cpu.ts

@@ -100,7 +100,7 @@ export async function GaussianDensityCPU(ctx: RuntimeContext, position: Position
                             data[idx] += dens
                             if (dens > densData[idx]) {
                                 densData[idx] = dens
-                                idData[idx] = id[i]
+                                idData[idx] = id ? id[i] : i
                             }
                         }
                     }

src/mol-math/geometry/gaussian-density/gpu.ts

@@ -242,7 +242,7 @@ function prepareGaussianDensityData(position: PositionData, box: Box3D, radius:
         const r = radius(j) + radiusOffset
         if (maxRadius < r) maxRadius = r
         radii[i] = r
-        groups[i] = id[i]
+        groups[i] = id ? id[i] : i
     }
 
     const pad = maxRadius * 2 + resolution * 4