| Since | 18.0 |
int usd_addinversetotransformorder(int stagehandle, string primpath, string name)
This function appends an inversed transformation to the primitive’s transform order. Transform order is a sequence of transform operations, whose full names are stored in xformOpOrder attribute as a string array. Thus, this function appends a new operation name to that attribute.
Inverse transforms are used primary for rotating (or scaling) around a pivot that does not coincide with the origin. The usual practice is to apply a translation to the pivot point, then perform rotation, and finally apply an inverse of the original translation. This function is used for applying the inverse of the original translation.
NOTE: unlike most VEX functions that deal with primitive transforms and take an operation suffix as a parameter, this function takes the full operation name. Use usd_transformname to obtain the full name if you know the suffix.
stagehandle
A handle to the stage to write to. Currently the only valid value is 0, which means the current stage in a node. (This argument may be used in the future to allow writing to other stages.)
primpath
The path to the primitive.
name
The full name of the transform operation. Use usd_transformname to obtain the full name from the operation suffix.
Returns
The value of stagehandle on success or -1 on failure.
Examples ¶
// Note, the USD_XFORM_TRANSLATE and USD_AXIS_Z constants used below // are defined in "usd.h" VEX header, so include it. #include <usd.h> // Construct the pivot translation operation suffix and name. string pivot_xform_suffix = "some_pivot"; string pivot_xform_name = usd_transformname(USD_XFORM_TRANSLATE, pivot_xform_suffix); // Rotate about z-axis that goes thru pivot (1,0,0). usd_addtranslate(0, "/geo/cone", pivot_xform_suffix, {1, 0, 0}); usd_addrotate(0, "/geo/cone", "some_rotation", USD_AXIS_Z, -90); usd_addinversetotransformorder(0, "/geo/cone", pivot_xform_name);
| See also | |
| usd | |
| usd_transform |