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Applying/mixing bump mapping to Princ Shader

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Having some issues understanding shading in Houdini.

I created a rigid body sim and the model already has UVs and some textures. I created some attributes and wanted to use them to add to these textures within Houdini, masking sections to add noise and add bump mapping to areas.

I would like to use the edge attribute I created to apply a crack style bump to the mesh. Please see the attached files. Issue is using the principled shader I dont know the best way to add these cracks to the exisiting bump map and also to have displacements too. How do you create a bump/normal shader from scratch?

Many thanks in advance,



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