points picking and drawing
Author
Please help give me some idea on how to :
1. loaded a whole list of coords(thounsands) of points from a file, want to create a set of wireframe from all the points.
2. allow user to use the to select each point, or to drag out a rect area to select all the points within the area.(i have read the tutorial here about picking, but seems cant apply to points.)
Thanks.
Well here is a quick explanation about picking:
The picking way of OpenGL is really very usefull for you in this case.How can you pick a point.OpenGL provides a way to create a rect(you give the dimensions) and the center of the rect are some given coords(you can use the mouse).So you create a rect 2x2 and if a point is in that rect it will be selected.OpenGL makes the things really easy and tells you if a more than one objects(or none) are inside that rect.Just read some complex tutorial about picking over the net and the things will become more clear.
The PAIN is coming...this summer!!!In cinemas everywhere.
The picking way of OpenGL is really very usefull for you in this case.How can you pick a point.OpenGL provides a way to create a rect(you give the dimensions) and the center of the rect are some given coords(you can use the mouse).So you create a rect 2x2 and if a point is in that rect it will be selected.OpenGL makes the things really easy and tells you if a more than one objects(or none) are inside that rect.Just read some complex tutorial about picking over the net and the things will become more clear.
The PAIN is coming...this summer!!!In cinemas everywhere.
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