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Quadratics Question

Started by Natz Feb 1, 2003 at 5:32 PM 1 replies 200+ views

Original Post

Feb 1, 2003 at 5:32 PM

Hello all, I''m writing an application that will require a selection indicator over a potentially rough/uneven section of land (land surveyor type application).. I''m looking to accomplish the effect the trainz land surveyor has (http://www.auran.com/trainz, you can see a sample of what im trying to accomplish at this link http://www.auran.com/trainz/moviez/th_surveyor1.jpg) My problem is in determining the best way to do a circular "selection indicator" that would mold to the land.. ive noticed that the trainz indicator is not perfect but it serves its purpose.. If anyone has any suggestions they are very much welcomed. Thanks! Nat

beaton_john

Feb 2, 2003 at 12:49 AM

Find the points that you want to draw. What i would do is use sin/cos functions to find a ring of points, then find the closest point on the height map. Once you have the xyz values for the points, simply draw a line loop

Natz

Author

Natz

Feb 2, 2003 at 11:10 AM

yeah im doing that now but it''s quite slow.. I''ll just find another alternative.

Nat

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