3D Shader co-ordinates

sensavenir

I'm trying to implement a collision system for a raymarched SDF renderer, which I've mostly managed to do except the collisions don't line up with the visuals at all. It seems like the coordinates for my spatial shader (in a cubic mesh instance) are different than those used for the KinematicBody transforms. Firstly, is there a way to get a readout of co-ordinate data from the shader itself? from what I can tell this is difficult if not impossible, so failing that does anyone know what the relationship is between these co-ordinates and how you could convert them? Thanks!

cybereality

The coordinates in a shader are arbitrary. Most likely model local, but it could be anything. You'd need to pass in transforms if you need world space or possibly look at the shader built-ins, it might be there already.

xyz

You can get most of the commonly needed stuff from built in variables. VERTEX gives you vertex position in object's local space. Multiplying it with WORLD_MATRIX will result in vertex position in the world space. Check the shading language reference to see available built-ins.