diff --git a/src/editor/app_context.ts b/src/editor/app_context.ts
index 511f10a..32531f9 100644
--- a/src/editor/app_context.ts
+++ b/src/editor/app_context.ts
@@ -11,7 +11,7 @@ import { MouseManager } from './mouse';
 import { MeshType, Renderer } from './renderer/renderer';
 import { AppConsole, TMessage } from './ui/console';
 import { UI } from './ui/layout';
-import { ColourSpace, EAction } from '../runtime/util';
+import { EAction } from '../runtime/util';
 import { ASSERT } from '../runtime/util/error_util';
 import { download, downloadAsZip } from '../runtime/util/file_util';
 import { LOG_ERROR, Logger } from '../runtime/util/log_util';
@@ -266,7 +266,6 @@ export class AppContext {
                     blockPalette: components.blockPalette.getValue().getBlocks(),
                     dithering: components.dithering.getValue(),
                     ditheringMagnitude: components.ditheringMagnitude.getValue(),
-                    colourSpace: ColourSpace.RGB,
                     fallable: components.fallable.getValue() as FallableBehaviour,
                     resolution: Math.pow(2, components.colourAccuracy.getValue()),
                     calculateLighting: components.calculateLighting.getValue(),
diff --git a/src/editor/worker/worker_types.ts b/src/editor/worker/worker_types.ts
index 32a5ea7..198cd9a 100644
--- a/src/editor/worker/worker_types.ts
+++ b/src/editor/worker/worker_types.ts
@@ -1,14 +1,11 @@
-import { BlockMeshParams, FallableBehaviour } from '../../runtime/block_mesh';
+import { BlockMeshParams } from '../../runtime/block_mesh';
 import { Bounds } from '../../runtime/bounds';
 import { TBlockMeshBufferDescription, TMeshBufferDescription, TVoxelMeshBufferDescription } from '../buffer';
-import { RGBAUtil } from '../../runtime/colour';
 import { TStructureExport } from '../../runtime/exporters/base_exporter';
 import { TExporters } from '../../runtime/exporters/exporters';
 import { MaterialMap } from '../../runtime/mesh';
 import { TMessage } from '../ui/console';
-import { ColourSpace } from '../../runtime/util';
 import { TAxis } from '../../runtime/util/type_util';
-import { TDithering } from '../../runtime/util/type_util';
 import { Vector3 } from '../../runtime/vector';
 import { TVoxelisers } from '../../runtime/voxelisers/voxelisers';
 import { AppError } from '../util/editor_util';
diff --git a/src/runtime/block_mesh.ts b/src/runtime/block_mesh.ts
index e62eb25..01fe17b 100644
--- a/src/runtime/block_mesh.ts
+++ b/src/runtime/block_mesh.ts
@@ -6,7 +6,7 @@ import { AppRuntimeConstants } from './constants';
 import { Ditherer } from './dither';
 import { BlockMeshLighting } from './lighting';
 import { Palette } from './palette';
-import { ColourSpace, TOptional } from './util';
+import { TOptional } from './util';
 import { ASSERT } from './util/error_util';
 import { Vector3 } from './vector';
 import { TDithering } from './util/type_util';
@@ -31,7 +31,6 @@ export interface BlockMeshParams {
     blockPalette: string[],
     dithering: TDithering,
     ditheringMagnitude: number,
-    colourSpace: ColourSpace,
     fallable: FallableBehaviour,
     resolution: RGBAUtil.TColourAccuracy,
     calculateLighting: boolean,
diff --git a/src/runtime/ots_voxel_mesh.ts b/src/runtime/ots_voxel_mesh.ts
index 388cc1c..bb029fd 100644
--- a/src/runtime/ots_voxel_mesh.ts
+++ b/src/runtime/ots_voxel_mesh.ts
@@ -18,14 +18,22 @@ export class OtS_VoxelMesh {
     private _voxels: Map<number, Ots_Voxel_Internal>;
     private _isBoundsDirty: boolean;
     private _bounds: Bounds;
+    private _replaceMode: OtS_ReplaceMode;
 
     public constructor() {
         this._voxels = new Map();
         this._bounds = Bounds.getEmptyBounds();
         this._isBoundsDirty = false;
+        this._replaceMode = 'average';
     }
 
-    public addVoxel(x: number, y: number, z: number, colour: RGBA, replaceMode: OtS_ReplaceMode) {
+    public setReplaceMode(replaceMode: OtS_ReplaceMode) {
+        this._replaceMode = replaceMode;
+    }
+
+    public addVoxel(x: number, y: number, z: number, colour: RGBA, replaceMode?: OtS_ReplaceMode) {
+        const useReplaceMode = replaceMode ?? this._replaceMode;
+
         const key = Vector3.Hash(x, y, z);
         let voxel: (Ots_Voxel_Internal | undefined) = this._voxels.get(key);
 
@@ -39,13 +47,13 @@ export class OtS_VoxelMesh {
             this._voxels.set(key, voxel);
             this._bounds.extendByPoint(position);
         } else {
-            if (replaceMode === 'average') {
+            if (useReplaceMode === 'average') {
                 voxel.colour.r = ((voxel.colour.r * voxel.collisions) + colour.r) / (voxel.collisions + 1);
                 voxel.colour.g = ((voxel.colour.g * voxel.collisions) + colour.g) / (voxel.collisions + 1);
                 voxel.colour.b = ((voxel.colour.b * voxel.collisions) + colour.b) / (voxel.collisions + 1);
                 voxel.colour.a = ((voxel.colour.a * voxel.collisions) + colour.a) / (voxel.collisions + 1);
                 ++voxel.collisions;
-            } else if (replaceMode === 'replace') {
+            } else if (useReplaceMode === 'replace') {
                 voxel.colour = RGBAUtil.copy(colour);
                 voxel.collisions = 1;
             }
diff --git a/src/runtime/util.ts b/src/runtime/util.ts
index d02f265..fd121d9 100644
--- a/src/runtime/util.ts
+++ b/src/runtime/util.ts
@@ -71,13 +71,6 @@ export class UV {
     }
 }
 
-/* eslint-disable */
-export enum ColourSpace {
-    RGB,
-    LAB
-}
-/* eslint-enable */
-
 export type TOptional<T> = T | undefined;
 
 export function getRandomID(): string {
diff --git a/tools/headless-config.ts b/tools/headless-config.ts
index f305b5c..a2cda6c 100644
--- a/tools/headless-config.ts
+++ b/tools/headless-config.ts
@@ -1,5 +1,4 @@
 import { PALETTE_ALL_RELEASE } from '../res/palettes/all';
-import { ColourSpace } from '../src/runtime/util';
 import { Vector3 } from '../src/runtime/vector';
 import { THeadlessConfig } from './headless';
 
@@ -20,7 +19,6 @@ export const headlessConfig: THeadlessConfig = {
         blockPalette: PALETTE_ALL_RELEASE, // Must be a palette name that exists in /resources/palettes
         dithering: 'ordered',
         ditheringMagnitude: 32,
-        colourSpace: ColourSpace.RGB,
         fallable: 'replace-falling',
         resolution: 32,
         calculateLighting: false,