Ramp | Effects | Color Remap

[lapdog]

I'm trying to understand the effects/color remap function using a simple example.

Create lambert, assign ramp texture to lambert color channel, and then insert a color remap (ramp/effects/color remap). This inserts two nodes (rgb/hsv, ramp) in the color channel between the original ramp and the lambert material. Thus the original ramp color is mapped to a rgb/hsv node which outputs is hue and value information to the uvcoordinates of the newly inserted ramp.

I am at a loss to explain the resultant output. What I expected was a) color override at the u coordiants and variation in intensity on the v coordiants. But obviously I'm way offbase in my assumptions.

BTW, I've looked at the shading map (which seems straight forward) as suggested in the online help.

Can someone clue me in here. I would really appreciate it.

[mikleing]

Starting with a ramp texture makes it seem more complicated - try using effects color remap starting with another texture like cloth and it'll be clear what's happening.

If you want the u ramp to be driven by something other than brightness, you can use the connection editor in hypershade to link the hue or saturation to the u coordinate input of the ramp instead. If you can't get one of the components like hue to work at all, the value might be out of range where it expects a 0 through 1 variation to drive the ramp.

If you want two ramps, one remapping the hue, the other remapping the brightness, then you could set that up yourself as separate ramp nodes, and put the output together in a HsvToRgb.

Is that what you're after?

-jeremy

[lapdog]

You are right, using a cloth texture and inserting a color remap (rgb2hsv, remapRamp) on the texture does make what is happening clearer.

If we change the remapRamp to a U ramp (as opposed to default V ramp) then the three hues from the cloth (gap, u cloor, v color) do indeed result in a three color output). In this case, it looks like the 0 to 360 values for hue are normalized to a 0 to 1 mapping for the u coordinates.

Your advice has been instuctrive and I thank you. I still find it difficult to predict the resultant outcome although its seems easier now to reverse engineer what is happening (at least in this example). Thanks again.