Do I need ambient occlusion when using hardware ray tracing?

In general, ray tracing calculates light and shadows in a physically accurate manner in real time. However, in high-end PBR pipelines (e.g., in Unreal Engine or V-Ray), a baked AO map is often used as a targeted multiplier (render pass). This enhances subtle contact areas, increases the microcontrast of materials, and delivers the perfect “look” for sophisticated e-commerce visualizations.

How do I bake (texture baking) an AO map?

Professional 3D studios use texture baking (e.g., in Substance Painter or Blender) to write the highly complex shadow information of a high-poly model into a high-performance grayscale texture (AO map). For e-commerce applications, this map is then often packed into the red channel of an ORM texture to drastically reduce draw calls in the web viewer.

Can I use ambient occlusion directly in the browser?

Yes. Modern web frameworks like Three.js support post-processing filters for SSAO, but this can impact performance on mobile devices. The best practice for an ROI-optimized e-commerce workflow is therefore to use baked AO maps (as part of the glTF/GLB file). This guarantees photorealistic shadows with lightning-fast time-to-interactive load times.

Does an AO map replace the normal map in the material?

No, the two technologies serve completely different purposes. The AO Map controls shading (shadows) in geometric recesses. The Normal Map, on the other hand, manipulates the orientation of surface normals to simulate fine micro-details (such as scratches or pores) in the light. Only when both maps are combined does an uncompromisingly photorealistic PBR material emerge.

What Is Physically Based Rendering (PBR)?

Q: What is Ambient Occlusion (AO)?

Ambient Occlusion (AO) is an essential shading technique in 3D computer graphics. It precisely calculates the extent to which certain areas of an object are obscured from indirect ambient light by surrounding geometry. The result is soft, realistic contact shadows in corners, crevices, and gaps, giving the Digital Twin a three-dimensional depth effect that is essential for premium brands.

Q: What is SSAO (Screen Space Ambient Occlusion)?

SSAO is a post-processing technique that does not precompute ambient occlusion but instead generates it in real time from the depth buffer (Z-buffer) of the rendered camera image. This is the standard in high-performance WebGL configurators and mobile AR applications. It is extremely resource-efficient but does not provide the microscopic precision of a pre-baked AO map.

Glossary

What is Ambient Occlusion (AO)?

Daniel Schuster

•

Last updated:

May 11, 2026

In this glossary article:

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Glossary

What is Ambient Occlusion (AO)?

Daniel Schuster

•

Last updated:

May 11, 2026

Definition of Ambient Occlusion (AO)

Ambient Occlusion (AO) is a rendering technique that simulates contact and corner shadows: areas that receive less ambient light are darkened. This makes models appear more three-dimensional and realistic—without the need for full ray-traced lighting. For marketing renderings, this means greater depth, sharper material edges, and a high-quality look with manageable computational overhead.

How It Works

AO calculates the extent to which a point on a surface is "occluded" by ambient light. Typical variations:

Baked AO-Map: statically baked into the texture (for 3D product visuals or Low-Poly-Assets) → Texture Baking (Map Baking)

Screen-Space Ambient Occlusion (SSAO): A real-time post-processing effect (e.g., in browsers/WebGPU, game engines).
Ray-Traced AO: more physically accurate, but more computationally intensive.

You can find more technical details about ambient occlusion here: Unreal Engine Docs – Ambient Occlusion

How Ambient Occlusion Works: A Direct Comparison of the AO Pass and the Final Rendering

Final 3D Rendering of the Living Room – danthree studio

AO-Pass Living Room CGI – danthree studio

3D rendering of a bright living room with a brown leather sofa and a view of the surrounding nature through large windows

From Technical Term to Visual Experience

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Ambient Occlusion vs. Ray Tracing

Criterion	Ambient Occlusion	Ray Tracing
Objective	Simulate Contact/Corner Shadows	Physically Accurate Light Paths
Quality	Good for local depth	Global Realism (Reflections, Refractions)
Performance	Very fast (baked/SSAO)	Greater computational effort
Real-time	Yes (SSAO)	Yes, but GPU-intensive (WebGPU/RTX)

Ambient Occlusion Workflow

Creating and Baking an AO Map – After UV unwrapping, we bake the AO in linear space. For more information, see the 3D Modeling section.
Enable and fine-tune SSAO —test the radius, intensity, and bias to avoid halos. For real-time use cases, see Augmented Reality with 3D & CGI.
Compositing – Place the AO pass over the beauty render in Multiply mode. You can find our pipeline in the 3D Animation Studio.
Preview & QA – Adjust the AO intensity to match the brand's CI (subtle rather than "dirty"). For additional tips, see the blog post " Shaders for Photorealistic CGI."
Export – WebP/AVIF for the web, TIFF/PNG for print; archive the AO pass separately.

Quick Tips for Ambient Occlusion

Use AO sparingly—too much darkening makes the image look “dirty.”
Always check that Baked AO is in linear space (not sRGB).
Test SSAO settings: Keep the radius small to avoid halos.
Keep the AO pass separate during compositing → for flexibility when making corrections.
Check whether AO is being applied twice (AO map + ray-traced GI) and reduce it if necessary.

Denoising/Compositing: Blender Denoise Node im Compositor (if you smooth the AO pass afterwards)

FAQ - Ambient Occlusion (AO)

Do I need ambient occlusion when I use ray tracing?

Not necessarily. Ray tracing calculates shadows in a physically accurate way. However, AO can be used as an additional pass to further emphasize small contact areas—the key word here is “subtle.” More on the physical background in the Rendering Equation (NVIDIA)

How do I bake an AO map?

Most 3D tools (e.g., Blender, 3ds Max, Cinema 4D) have an AO bake mode. For Blender, see Ambient Occlusion Bake – Blender Manual

What is SSAO?

Screen Space Ambient Occlusion is a post-processing technique that approximates AO from the fully rendered screen content—it's fast, but less accurate. Details: Unreal Engine Docs – Screen Space Ambient Occlusion

Can I use AO in my browser?

Yes. Many WebGL/WebGPU frameworks include SSAO filters or allow custom shaders. Overview of the API: MDN Web Docs – WebGPU API

Does an ambient occlusion map also enhance surface details such as wrinkles or pores?

No. AO only calculates shadows in recesses. For fine surface details, you need normal maps. The two maps complement each other: AO for contact and edge shadows, and normal maps for microstructure.