BGE HBAO Ambient Occlusion Shader

Game Engine Game Engine Resources
36

UPDATE - UPBGE only

Ok as promised, here is the update.

IMPORTANT:
To increase performance and quality on smooth curves, the shader uses the UPBGE render attachments to read the normals from.

Setup guide:

  1. Add an Attachment under “Render”-tab > “Attachments” (UPBGE v0.2.5+) and set up like this:
    setup_1

  2. For EACH MATERIAL in your scene, use material nodes and output the attachment like this:

    setup_2
    setup_2770×353 38.1 KB

    (you can also replace the normals from the Geometry node with the normals from a “Material” or “Normal Map” node to include textured normals)

  3. Add the HBAO shader
    hbao.glsl (8.2 KB)

  4. Configure shader variables under “THIS NEEDS TO MATCH YOUR CAMERA SETTINGS” and “USER VARIABLES”

    setup_3
    setup_31055×588 85.7 KB

  5. Enjoy

Results:

AO Only:

hbao1.PNG
hbao1.PNG1359×909 220 KB

Shaded scene:

hbao1_shaded.PNG
hbao1_shaded.PNG1339×906 285 KB

Changelog:

  • Implemented dedicated normal pass through UPBGE Attachments
  • Improved noise influence to break up the before clearly visible sampling ray directions
  • The geometry distance now influences the AO radius, so the AO effect doesn’t “scale up” when you move away / “scale down” when you move closer
  • Fixed bug where the “sampleSteps” variable wasn’t used correctly
  • Slight performance increase

Todo:

  • Fix on AMD (I only have an Nvidia card)

Note:

Because this came up many times:

The HBAO algorithm is VERY performance hungry, this is something I cannot change. So don’t expect your inbuild/old graphics card to run this!

Even current AAA games only use HBAO if you are on HIGH settings!

Anyways, hope this update will help you.

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