Weird bug with color dodge, I need a way around this!

[J3sseM]

Hey guys!

So I have some lights in my game set up with substract effect, but those seems a bit flat.
Now they hang from the roof and slowly swings in small angle. My lights are shaped as cones now. Those are ok but I would like to make them better.

So to do that I made White cone with black background and select effect "Color Dodge" - and it looks brilliant!

The problem is that when I set my color dodge cone to swing with my lights: Sin(R)*Ang
For some reason it moves the whole background from the area that light covers.

I don't think that the problem is with code, but with the shader.
Anyway it is possible I have missed something, so please any suggestions will be great! Can't figure this out. And after seeing how much better my lights look I don't want to skip this idea.

Thanks!

EDIT: It seems to do same with pretty much every custom shader. Argh need to figure this!

- Jesse

[J3sseM]

Bumping this!

So, I tried with .png and after that .jpg to make sure it's not anything to do with .png alpha channels.
Other effect shaders does this aswell!

Could someone try, enable HWA and create a cone. Put effect "Color Dodge" and put some angle on it. I mean angle that changes and you'll see.
"Blank" space around the light cone starts to rotate the background. It's all messed up. If the cone sits still, or if I even move it with mouse or keyboard in runtime it's all fine. But ANGLE seems to bug.

Can someone confirm that the same happens with you?

[J3sseM]

Bump!

Still can't figure this out. :/

[Alonso]

I can't really tell what the problem is without images or an mfa, but have you limited R (and G and B) to be from 0-255? That is, if I understood right and the following sets an effect parameter, min(255,max(0,Sin(R)*Ang))?

[J3sseM]

Hello Alonso!

I have not limited RGB. I tried but it did not work, or more likely I did it wrong.
Could you take a look at demo .mfa?

Thanks!

- Jesse