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Get the width, height and depth of the group. Please note that
The dimensions will be returned inside the parameter "dimension"
dimension[0] will become the depth
dimension[1] will be the width
dimension[2] will be the height
the dimensions are according to the bottom and the front of the group.
To declarea polygon as being the bottom of the group see those function
STATE_polygon_set_orientation()
Returns OK or VR_ERROR;
Example:
double size[3];
STATE_group_get_dimensions(my_group, size);
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