Basic data types

Question

Hi~
 
I want to progamm add-on application of gear hobbing using the CoCreate/SolidDesigner Integration Kit.
But I met some questions about the basic data types in Modeling sofeware environment.
Just like point (gpnt3d or gpnt2d),  direction ,  vector , position , u-vector , gpntwc , etc.
Does anybody could help me to explain them , and what difference between them?
 
Thanks
 
JustinThis thread is inactive and closed by the PTC Community Management Team. If you would like to provide a reply and re-open this thread, please notify the moderator and reference the thread. You may also use "Start a topic" button to ask a new question. Please be sure to include what version of the PTC product you are using so another community member knowledgeable about your version may be able to assist.

PeterKehoe · Accepted Answer

The length of a direction is always 1. (e.g. 1,0,0 or 0,-0.5,0.866)A vector is essentially a direction and distance. It is expressed as the distance in each of the 3 directions (e.g. 0,10,5 or 1,1,1)A position is the coordinates in X, Y, and Z, but it can also be thought of as a vector from 0,0,0 to the point.gpnt3d is the construct for a value with 3 coordinates. This can represent a 3D position (point), a vector, or a direction since all three have 3 values.gpnt2d is the construct for a value with 2 coordinates. This is normally the 2D coordinates of a point on a workplane.gpntwc is the construct for when you pick a point in the viewport (if you don't pick on an existing object)

sobrien-2_53235 · Answer

Justin,gpnt3d is the data structure for a 3D coordinate or vector.  This structure can be created from the X, Y, Z values using the make-gpnt3d command and likewise the X, Y, Z values can be read from the gpnt3d structure using the gpnt3d_x, gpnt3d_y and gpnt3d_z commands.Below is how this might look in lisp code.  This is not tested so forgive me if I typed something in wrong (which is highly likely).(setf coord (make-gpnt3d :X 23.67 :Y 52.69 :Z 75.23))  ; sets variable coord with x=23.67, y=52.69 and z=75.23(print coord) ; in case you want to see the coord values in the consule window (to help with debugging)(setf xcoord (gpnt3d_x coord))  ; sets xcoord to the X coordinate of coord(setf ycoord (gpnt3d_y coord))  ; sets ycoord to the Y coordinate of coord(setf zcoord (gpnt3d_z coord))  ; sets zcoord to the Z coordinate of coordAs applied to vectors, the X value is the magnitude in the X direction, etc.Hopefully this gets you headed in the right direction.Scott

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