michiel | a year ago | 12 comments | 9 likes | 705 views

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When you apply the new PBR effect, the SPECULARITY prop is replaced by the FX ROUGHNESS, METALNESS prop. This is an advanced lighting model used by Physically Based Rendering (PBR).

It is used by the GLB 3D model format to define its materials. For this reason, the PBR effect is automatically applied when you load a GLB model. When the FX ROUGHNESS, METALNESS prop is set to its default value of (-1,-1), the settings are taken from the model file. For most models this is the best setting.

But when you want to use your own settings, you can overrule the model materials by setting this prop to 0 or higher.

The installer comes with a show to play around with this new lighting model:
BluffTitler\Media\Shows\Light\PBR.bt

It uses the System\Spheres_PBR effect to render the spheres. Play around with its props, its cube map and the light layer props to develop a good understanding of this model.

Here's an example how you can change the look of a model by changing this prop.

On the left, the FX ROUGHNESS, METALNESS prop is set to (1, 0). This makes it look like concrete.

In the centre, the prop is set to (-1, -1). This means that it uses the settings from the model file: as the model designer has designed it.

On the right, the metal is exaggerated, making it look like chrome.

The model can be downloaded here:

michiel, a year ago

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