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--- en:math_guide_orientation [2021/04/30 07:47]
JSCAD Editor created
+++ en:math_guide_orientation [2021/05/01 01:46] (current)
JSCAD Editor
@@ Line 1: / Line 1: @@
 ===== Orientation =====
-tbw
+All the internal calculations of JSCAD (and other included libraries) are based on the 'right-hand' rule. (For more information see discussions [[https://en.wikipedia.org/wiki/Right-hand_rule|here]] and [[https://www.pasco.com/products/guides/right-hand-rule|here]].)
+{{ :wiki:right_hand_rule_cross_product.svg?nolink&300 | Right-hand Rule}}
+This results in the following orientation of the three-dimensional coordinate system, i.e. orientation of X, Y, and Z axis.
+  * Positive X points to the right
+  * Positive Y points to the back
+  * Positive Z points to the top
+{{ :wiki:coordinate_system.svg?nolink&300 | Coordinate System}}
+This also means that positive rotations are
+  * From positive X to positive Y about the Z axis
+  * From positive Y to positive Z about the X axis
+  * From positive Z to positive X about the Y axis
+It may take some time to understand well, and can be visualized by rotating shapes by both positive and negative angles.