Filterforge as a Renderer

Hello Dear Filter Forge users,
Assume that I have separate external texture maps such as normal map, bump map or specular map. I want to use filter forge as a renderer for final image. I know it might be a weird question but i couldn't find any software or a plugin making this. Basically imagine this filter might include several image inputs such as normal map image input, bump map image inputor specular map image input. I've tried to apply wonderful filter by Zoltan Erdokovy (Bump tool) to my needs, but there should be better more practical way to do it, So I kindly ask advanced filterforge users to help me.
Best Regards.

Filterforge Renderer (1).ffxml

Thank you for your reply,
But what confuses me is that height maps and bump maps are different than each other. Also, many professional texture packs include normal maps rather than bump maps. So it'd be better if we can have a normal map to height map snippet. I searched the forum, there were some questions about it but couldn't come to a conclusion. For example in other forums I've found a way but I'm not sure if it's mathematically correct. They say that you need to separate R,G,B.
Fill B with white, use R,G datas and blend them using overlay mode to convert normal map into a bump map. (Is it a correct way to do it?)

A normal map can be generated from a height/bump map by comparing adjacent pixels (or samples in FF) and calculating the surface slope. FilterForge does this internally from a given height map. In this process, you gain directional information, but lose height information. It's more complicated (or impossible) to accurately do this in reverse, but there are certainly tools that can approximate this (google height map to normal map).

I checked out a few papers exploring this, but it's very math/resource heavy and requires information about how the normal map was created. Might be doable in FF, but would require quite a bit of work.

Maybe you can clarify what your end goal is here?

I made a simple shading setup that uses a normal map instead of a height map. It's not accurate, but can get results similar to the FF surface renderer output. If an ambient occlusion map is available, it should be used instead of the rough approximation.

I only used one set of texture maps to test this, so likely needs tweaking to work with other maps. Here is a comparison between the two.

First of all it's very fast and gives quite similar results. Thank you very much, and you should publish it I guess, once again thank you for your support and time.