Map If

Map If is a condition for maps: it compares A with B, and outputs True when the test passes and False when it fails. Use it for rules such as one branch angle below a height and another above, or, on a decoration, a different density on older parts of the finished tree (age). Mapping covers the idea.

Settings

A is an attribute, u by default, picked from the float and integer attributes the tree carries. Condition is the test: >, >= (the default), ==, <= or <. B is the value to compare against, 1 by default. True is the value when the test passes (1 by default) and False when it fails (0). The menu beside True and False multiplies the value: by 1, 10 or 100, or by 137.5 or 360 for angles.

Inputs and output

Any of the four can be a map instead. The inputs are True, False, B and A, from top to bottom. Wire a map into one and its field shows the map's path instead of a value.

To compare two attributes, wire a Map Attribute reading the second one into B. To compare an attribute read at the parent, use a Map Attribute set to Parent in A.

The output goes into another map node, or is picked by a parameter's map button. With a map selected, click Map If on the Natsura toolbar, then Append (left) or Insert (right) to add a Map If before or after it. Insert puts the selected map into the first input, True, not A.

For a gradual change instead of a hard switch, use Map Blend.

Status

Map If's threshold could once read an attribute directly. That option is gone: when an old scene loads, the upgrade says which attribute it read, and wiring a Map Attribute for it into B restores the comparison.