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--- tools:s-tk:eval-node [2019/07/30 15:51] – created lightwolf
+++ tools:s-tk:eval-node [2019/08/08 15:54] (current) – lightwolf
@@ Line 1: / Line 1: @@
 ====== Spline Evaluation (Node) ======
+{{ :tools:s-tk:pasted:20190808-155428.png}}
 This node can evaluate [[primitive]] and return the position as well as the orientation at any position along the spline.
+===== Controls =====
+==== Spline ====
+Allows you to pick any of the [[primitive]] in the scene to evaluate.
+==== Displacement ====
+This is the position on the spline. Depending on the **Displacement Type**, 0-100% is either the complete length of a spline or the first span. 100%-200% would then be the second span respectively.
+==== Displacement Type ====
+This determines how the **Displacement** is interpreted to evaluate the spline.
+  * **Complete Spline** In this mode, the spline is taken as a whole, 0% is the start of the spline, 50% the middle of it and 100% the end.
+  * **Per Span** In this mode, every successive value of 100% corresponds to a span. For example, an open spline has five knots - which is four spans. 400% would then be the and of the spline. 250% would evaluate half way between the third and the fourth knot.
+==== Look Ahead ====
+If Look Ahead is off, the rotation will align to the spline at the current position.
+If Look Ahead is turned on, the rotation will be align to a different position on the spline, depending on the value of **Look Ahead Displacement**.
+==== Look Ahead Displacement====
+If **Look Ahead** is enabled, this determines how far ahead (or back) along the spline the point is that the rotation aligns to. This is using the same units as **Displacement** and also depends on **Displacement Type**.
+This value is added to the current position.
+==== World Coordinates ====
+Computes the point on the spline and the orientation in world as opposed to object coordinates.
+==== Pre/Post Behaviour ====
+Determines what happens if the displacement would evaluate before the start or beyond the end of the spline respectively.
+These options are only available for open splines:
+  * **Hold** Holds the position at the start or the end of the spline respectively.
+  * **Loop** Loops the position on the spline.
+  * **Mirror** Mirrors the position on the spline.
+==== Position ====
+The positions computed by the node may be modified here.
+The input position is either the position connected to the Position input on the node or the values set in the **Position** control.
+=== X/Y/Z Mode ===
+  * **Replace** (default) The position value of the axis is overwritten with the value computed by the node.
+  * **Ignore** The computed position on the spline is ignored and the original value passes through.
+  * **Add** The computed value on the spline is added to the position.
+  * **Multiply** The computed value on the spline is multiplied by the position.
+=== Position ===
+A position that may be modified or overridden by the spline evaluation.
+==== Rotation ====
+The rotation computed by the node may be modified here.
+The input rotation is either the rotation connected to the Rotation input on the node or the values set in the **Rotation** control.
+=== Heading/Pitch/Bank Mode ===
+  * **Replace** (default) The rotation value of the axis is overwritten with the value computed by the node.
+  * **Ignore** The computed rotation on the spline is ignored and the original value passes through.
+  * **Add** The computed value on the spline is added to the rotation.
+=== Rotation ===
+A rotation that may be modified or overridden by the spline evaluation.
-{{ :tools:s-tk:pasted:20190730-155023.png}}

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