
	Combining U & V

COMBINING AND MODIFYING U & V

The U and V nodes are almost uniquely suited to modification by Poser's maths nodes. We can take our simple gradients, and reverse them, combine them to produce diagonals, turn them into stripes, bars or even circles.

Reversing U & V

The first thing we look at is reversing the U and V nodes to get a right-to-left or top-to-bottom fade instead of the normal left-to-right or bottom-to-top. All this needs is one extra node. Create a maths node, set it to subtact and set both Value1 and Value2 to one. Plug your U or V node into the Value2 input on the maths node to invert the U or V node (this also works with any black and white node to produce a reversed version. Using colour maths it is also possible to produce negatives of colour inputs).

Fig 1: Reversing the U Node

Combining U & V

Combined, the U and V nodes can be used to create a diagonal gradient. This needs three nodes - one maths as well as the U and V nodes. This time, your maths node needs to be a Add node. Set both values to 0.5, then plug U into one and V into the other. This will produce a diagonal gradient running from zero at the bottom left to one at the top right.

Fig 2: Combining U & V

Like any other node, this diagonal node can be inverted. Plug the output of your add node into a subtract node as shown in figure 3 below and your diagonal gradient will now run from top right to bottom left.

Fig 3: Inverted combined U & V

Finally, you might want the gradient to run from top left to bottom right. To do that, you invert the U or V node using the setup back in figure one before plugging one inverted and one normal node into the add node. Figure Four shows the result of adding a inverted V-Node to a normal U-Node. Swap the U and V nodes over to get the reverse gradient.

Fig 4: Modified combined U & V