grid2model_lu x yGRID2MODEL_LU(nged)
NAME
grid2model_lu - convert grid xy to model coordinates (local units)
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SYNOPSIS
DESCRIPTION
The grid2model_lu command converts a 2D grid offset (in local units) into 3D model-space coordinates (also in local units). The two arguments u and v are the horizontal and vertical grid offsets from the model origin projected into the current view’s grid plane. The Z component is treated as 0.
The command works by projecting the model origin into view space, adding the scaled grid offset, then inverse-transforming back through the view-to-model matrix. The result is a 3-component model-space point in local units. All scale factors use the current view’s gv_scale and the database unit conversions.
The inverse operation is model2grid_lu.
EXAMPLES
Example 1. Convert a grid offset to model coordinates
mged> grid2model_lu 50 25
Returns the 3D model-space coordinates (in local units) corresponding to a 2D grid position 50 units right and 25 units up from 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