(Fixed) [HOU-2019] bezier Curve node and layer Node issues

[david.anastacio]

Hi,

I'm having some issues with the curve node during IPR rendering and setting maps to debug mode.
VFH: 4.30.03 from 2020-07-07

The value outputs from the curve are wrong.

Starting with a simple gradient that ranges from 0.0 to 1.0;

Applying a curve adjustment to it gives you over 1.0 values on values that weremid gray before, curve clamp is ON (extrapolate off);

This also happens on other inputs, here with a noise;

Also happens if the curve is linear;


This is an issue and should not happen. Makes it really hard to use the debug mode to build your maps/shaders.

Also there's a typo in the "Extrapolate Beyond End Points" in the curve node and noise node, Beyond is written as "Beyound".


Best,
David.

[chakarov]

Thanks david.anastacio I'll take a look.

[chakarov]

Reproduced and logged as HOU-2019, will message you back when I have more info.

[david.anastacio]

chakarov thanks

[bdancer]

"Don't extrapolate" means "use first/last point values" so the result is correct.
I'll add a specific extrapolate mode with user adjustable below first / after last point values, will this be ok?

[david.anastacio]

Hi,

bdancer , this options all seem pretty unnecessary in every days shading.... a simple clamp is what we need. I don't see much need for 2 seperate extrapolate options for the curves. And would definitly help if it was called "Clamp", this "Extrapolate Beyond End Points" doesn't help anyone, even chakarov mentioned in another post that name was not clear.
Yes we can just add a clamp node after every curve or berconNoise, but that's a lot of nodes to add.

Also I need to point out that the info on this in the VFH manual seems to be incomplete and should be added.

Best,
David.

[bdancer]

To be totally clear:
1. does clamp need to work only outside the points range?
2. if not only outside - if point value is 5 how should I clamp it (force 1) or remap to 0-1?

[david.anastacio]

bdancer Just like the clamp node would be nice, clamp not remap. To remap values we can use the set Range node if we need.


Best,
David.

[bdancer]

I've added clamp awhile ago, have u tried it? Does it do whats needed?

[david.anastacio]

I have not seen it, when did you add it?
The lastest version I have here from the 21.07.2020 and only "extrapolate" on the curve node.
I'll check it out tomorrow when we get the new nightly.

Best,
David.

[david.anastacio]

Just tested it today bdancer, perfect, thanks

[david.anastacio]

Hey,

Back with this one bdancer.
I realized that the clamp is still not working completely, my previous assumption was based on reading the resulting values of the curve node in the VFB, but the VFB doesn't render negative values so I didn't spot this before. The clamp is only working at 1.0 (or the value defined in the "Clamp Value"), it should also clamp 0.0. Just like the clamp node does with the min and max colors.

Best,
David.

[david.anastacio]

Hi,

I noticed you added the 0 clamp now. Thanks

Best,
David.