Render normal map and motion vectors for FX symulation.

Why we need it? To create next gen particle systems for example in game engines.

Example of motion vectors use: youtube.com/watch

Example of normal map use: youtube.com/watch

Most of 3D apps allows to render easily passes for smoke simulation, but in blender I have hard time to find the way to accomplish this because normal pas does not include volume normal. For normal map I found thread on unity forum where user Martin_H give solution to render normal map.

Thread: forum.unity.com/threads/volumetric-smoke-shader.358315/page-8

Link to blend file: keinebilder.de/temp/BigFlame2.blend

For motion vectors I only found thread to render motion vectors for objects but it fails to render volumes

Thread: blenderartists.org/t/functionality-expansi-custom-motion-vector-export-capability-willing-to-pay-donate/551528/3

Also I try to use this shader : blenderartists.org/t/motion-blur-on-fire/1100414/6 but effect was bad.

It will by nice to have easy access to render this kind of textures, by selecting render pass or by prepared shader like Principled BSDF.