diff --git a/libs/viewer/include/viewer/SimpleViewer.h b/libs/viewer/include/viewer/SimpleViewer.h
index 6573034321..a8c534f675 100644
--- a/libs/viewer/include/viewer/SimpleViewer.h
+++ b/libs/viewer/include/viewer/SimpleViewer.h
@@ -31,6 +31,7 @@
 
 #include <utils/Entity.h>
 
+#include <math/mat4.h>
 #include <math/vec3.h>
 
 namespace filagui {
@@ -243,7 +244,7 @@ private:
     float mCurvePlot[1024 * 3];
 };
 
-filament::math::mat4f fitIntoUnitCube(const filament::Aabb& bounds);
+filament::math::mat4f fitIntoUnitCube(const filament::Aabb& bounds, float zoffset);
 
 } // namespace viewer
 } // namespace filament
diff --git a/libs/viewer/src/SimpleViewer.cpp b/libs/viewer/src/SimpleViewer.cpp
index aadd51b8c9..b82091f19c 100644
--- a/libs/viewer/src/SimpleViewer.cpp
+++ b/libs/viewer/src/SimpleViewer.cpp
@@ -42,7 +42,7 @@ using namespace filament::math;
 namespace filament {
 namespace viewer {
 
-filament::math::mat4f fitIntoUnitCube(const filament::Aabb& bounds) {
+filament::math::mat4f fitIntoUnitCube(const filament::Aabb& bounds, float zoffset) {
     using namespace filament::math;
     auto minpt = bounds.min;
     auto maxpt = bounds.max;
@@ -51,7 +51,7 @@ filament::math::mat4f fitIntoUnitCube(const filament::Aabb& bounds) {
     maxExtent = std::max(maxExtent, maxpt.z - minpt.z);
     float scaleFactor = 2.0f / maxExtent;
     float3 center = (minpt + maxpt) / 2.0f;
-    center.z += 4.0f / scaleFactor;
+    center.z += zoffset / scaleFactor;
     return mat4f::scaling(float3(scaleFactor)) * mat4f::translation(-center);
 }
 
@@ -348,7 +348,7 @@ void SimpleViewer::populateScene(FilamentAsset* asset, bool scale,
         if (scale) {
             auto& tcm = mEngine->getTransformManager();
             auto root = tcm.getInstance(mAsset->getRoot());
-            filament::math::mat4f transform = fitIntoUnitCube(mAsset->getBoundingBox());
+            filament::math::mat4f transform = fitIntoUnitCube(mAsset->getBoundingBox(), 4);
             tcm.setTransform(root, transform);
         }
 
diff --git a/samples/gltf_viewer.cpp b/samples/gltf_viewer.cpp
index d70c99848f..207751ffb0 100644
--- a/samples/gltf_viewer.cpp
+++ b/samples/gltf_viewer.cpp
@@ -261,7 +261,7 @@ static void createGroundPlane(Engine* engine, Scene* scene, App& app) {
 
     Aabb aabb = app.asset->getBoundingBox();
     if (!app.actualSize) {
-        mat4f transform = fitIntoUnitCube(aabb);
+        mat4f transform = fitIntoUnitCube(aabb, 4);
         aabb = aabb.transform(transform);
     }
 
diff --git a/web/filament-js/filament.d.ts b/web/filament-js/filament.d.ts
index a3231463ff..ee4304b1e0 100644
--- a/web/filament-js/filament.d.ts
+++ b/web/filament-js/filament.d.ts
@@ -143,6 +143,9 @@ export interface View$VignetteOptions {
     enabled?: boolean;
 }
 
+export function fitIntoUnitCube(box: Aabb): mat4;
+export function multiplyMatrices(a: mat4, b: mat4): mat4;
+
 // Clients should use the [PixelBuffer/CompressedPixelBuffer] helper function to contruct PixelBufferDescriptor objects.
 export class driver$PixelBufferDescriptor {
     constructor(byteLength: number, format: PixelDataFormat, datatype: PixelDataType);
diff --git a/web/filament-js/jsbindings.cpp b/web/filament-js/jsbindings.cpp
index 7ddcf6a781..3e02d3e47b 100644
--- a/web/filament-js/jsbindings.cpp
+++ b/web/filament-js/jsbindings.cpp
@@ -1903,6 +1903,14 @@ class_<SimpleViewer>("SimpleViewer")
     .function("keyUpEvent", &SimpleViewer::keyUpEvent)
     .function("keyPressEvent", &SimpleViewer::keyPressEvent);
 
+function("fitIntoUnitCube", EMBIND_LAMBDA(flatmat4, (Aabb box, float zoffset), {
+    return flatmat4 { fitIntoUnitCube(box, zoffset) };
+}));
+
+function("multiplyMatrices", EMBIND_LAMBDA(flatmat4, (flatmat4 a, flatmat4 b), {
+    return flatmat4 { a.m * b.m };
+}));
+
 } // EMSCRIPTEN_BINDINGS
 
 #pragma clang diagnostic pop