global_illumination

Global Illumination

This page presents a quick start guide to let you easily setup global illumination in your Armory projects.

Armory features a fully dynamic global illumination technique based on a combination of voxel cone-tracing and screen-space ray-tracing. First, the scene is voxelized and processed into a 3D texture. This data is then used to gather ambient occlusion of the scene. Afterwards, screen-space ray-tracing is performed for detail.

• Get the teapots .blend scene.

Requirements

• A graphics card with OpenGL 4.4 or Direct3D 11 support (for voxelization).
• Runs on Windows and Linux.

Voxel AO

Enable Properties - Render - Armory Render Path - Voxel AO.

The cheapest way of utilizing voxels, usable for ambient occlusion and shadows.

• Control the quality using the Cones property.
• Control the intensity using the Occlusion property.
• Tweak tracing parameters using the Step, Range, Offset properties.

Voxel Volume Setup

Locate Properties - Render - Armory Render Path - Voxel AO panel to configure voxelization volume.

• Adjust Dimensions to control the volume size. Objects placed out of this volume will not contribute to global illumination. By default, dimensions are set to 16 - meaning a volume of 16x16x16 blender units gets voxelized.
• Set Resolution to specify amount of voxels used for the volume. For performance, keep this at 128 or below.
• Reduce the Resolution Z multiplier to conserve memory if your scene is mostly flat on the Z axis (like a chess board). With Resolution Z set to 0.5, 16x16x8 dimensions will get voxelized.
• Enable Revoxelize property to update voxel volume every frame. In case of mostly static scenes, you can keep this off - moving objects will receive indirect lighting, but will not affect it. To prevent object from contributing into indirect lighting, enable Properties - Object - Armory Props - Mobile.
• With Revoxelize checked, enable Dynamic Camera to voxelize scene around the camera. As the camera moves, voxelization volume will move as well, making it possible to cover infinitely big scenes. With Dynamic Camera disabled, the volume at the scene origin(0,0,0) gets voxelized.
• Temporal Filter will blend the indirect lighting with results from the previous frame, in order to minimize flickering.

Screen-space ray-tracing

Ray-traced AO

Set Properties - Render - Armory Render Path - Post Process - SSGI - SSAO to RTAO.

Ambient occlusion will be traced.

• Control the quality using the Rays, Step, Max Steps properties.
• Control the intensity using the Strength property.

Ray-traced Shadows

Small scale contact shadows will be traced.

Enable Properties - Render - Armory Render Path - Post Process - SSRS.

• Increase Step in case of artifacts.

Ray-traced Reflections

Local reflections will be traced.

Enable Properties - Render - Armory Render Path - SSR.

• Increase Step in case of artifacts.

Baked lighting

Blender has a full path-tracing Cycles engine integrated. For static scenes, you can pre-bake lighting down into lightmaps using the built-in Armory Bake tool.

• Locate Properties - Render - Armory Bake panel.

• Add objects to be baked or click Triangle - Add All.

• Hit Bake to generate lightmaps for all listed objects.

• Once done, hit Apply to restore materials and pack lightmaps.

• Optionally, set Properties - Render - Armory Render Path - Preset to 2D/Baked.

• Run(F5)! Armory picks up baked materials.

• Get example .blend scene.

Light probes

Currently supported light probe features:

• Cubemap example .blend
• Plane example .blend