model2grid_lu x y zMODEL2GRID_LU(nged)
NAME
model2grid_lu - convert model xyz to grid coordinates (local units)
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SYNOPSIS
DESCRIPTION
The model2grid_lu command converts a 3D model-space point (in local units) into a 2D grid offset (also in local units). The three arguments x y z are the model-space coordinates in local units. The result is a 2-element u v string representing the horizontal and vertical grid displacement from the projected model origin — only the X and Y components of the view-projected difference are returned, not Z.
The command converts the input point to base units, projects it and the model origin into view space, subtracts to get the view-space displacement, then scales by gv_scale and the unit conversion factor to get the final grid-space offset in local units.
The inverse operation is grid2model_lu.
EXAMPLES
Example 1. Convert a model point to a 2D grid offset
mged> model2grid_lu 100 50 0
Returns a 2-element u v grid offset in local units representing the screen-space position of model point (100, 50, 0) relative to the projected model origin.
AUTHOR
BRL-CAD Team
BUG REPORTS
Reports of bugs or problems should be submitted via electronic mail to devs@brlcad.org