[HOU-1460] Volume grid Undo and stuff

[psanitra]

Seem like Undo is not working when modifying ramps in the floating windows of volumetric grid. Can you please enable it?

With it not working, if i press undo, it will look like it`s doing anything, but it will be actually undo the stuff you did before you opened the floating windows, great way to mess up your scene, learned the hard way...

Also when adjusting the colors of the ramp, for example for the fire, color picker seems to be living in it`s own world, instead of being interactive, so it`s not possible to change colors of fire and get render feedback, unless you click OK and then it updates. Not great. Please make it interactive.

thank you!

[chakarov]

Hi psanitra , looks like undo is not handling ramp or color changes for VolumeGridShader, also the color selector is not exactly interactive. I've reported both issues under one number in our system.