Gradient problem

[bdamien]

I need to figure out how to create a gradient which is applied to object based on objects Y scale. Let's say Y scale is 0,5 then only half of the gradient is projected to object and if object scale is 1 then the full gradient is shown. Example of this is a wave spectrum where low dB is in green and high dB values get e.g. red color.

Any ideas? I hope I was able to explain this somewhat clearly..

[rray]

Could you just use the local Y coordinate to pick the color? This would be done purely in the Render tree, looking like this:

Vector state node(Intersection Point) -> vector to scalars -> (Y) -> Mixers/Gradient

If the object is animated, you could put a "vector coordinate converter" node between the first two.

[bdamien]

Since I'm new to SI and to rendering I didn't quite get what you meant. But I was (almost) able to get the effect I wanted by using Vector_to_scalar -> Gradient (range_max) nodes.

Now what happens is that positivie Y-axis gets the gradient correctly but on the negative Y it has no effect. So it should project the gradient on positive and negative Y the same way.

[rray]

Best option it seems is if you create a vector_to_scalars (plural scalars) node and plug its X output into range_min, and its Y output into range_max. You can then control the position of the gradient easily by entering numbers for X and Y. If it previously didn't go into negative Y, you can try setting the range_min to negative values

[bdamien]

Thanks a lot! That was exactly what I was looking for!

I also should try to read a bit more carefully.. I didn't notice that it was indeed vector_scalarS node you were talking about in the first place so that's what got me confused:)

Cheers!

[rray]

"Vector to scalars" I did only put there to have a UI to enter the values, two "scalar save state" nodes would've done it too. It's strange that range_min and range_max are not exposed in the gradient node.