how couple environment texture rotation to sun direction?

[3dworks]

i try to match the rotation of the reflected environment texture to my 'sun by direction' rotation. what kind of node/math setup should i use when doing so? in order to get the direction of the sun i can use the 'forward' directional vector from the item info node, but then, how convert this to degrees of rotation? i also need to be able to enter a manual offset of rotation in degrees, as each environment texture has different fixed sun positions. see a screenshot here

thanks for your input

markus

[juanjgon]

This setup should work. The vector to scalar node is in "X Channel" mode to get the heading, and the multiply node is inverting the angle, so set the B parameter to -1.0.

Thanks,
-Juanjo

[3dworks]

thanks juanjo, i guess it is solution for direct light orientation. unfortunately, i have a setup with a keyframed targeted light, so basically i have to find out first how to calculate the directional vector for a light - target null, then feed your nodes with that...

anyone can help me with that part? in other words, a nodal setup to calculate right up and forward from a object with is rotated because of poniting at a target.

cheers

markus

[VIZUALIZACE-CZ]

Hi juanjgon
how should the Node Editor look like when I use Light info and Direction instead of Item info?

I'm trying to find a way to rotate the HDR Enviroment Texture map (Heading Rotation) with Direct Light in the scene (I'm using the keyframe option)