Kevin Kronmiller (kkronmil++at++metricsys.com)
Wed, 2 Jun 1999 10:16:12 -0500
I have a performer application that I am having some trouble with. I want to return the Latitude and Longitude based on mouse location over the terrain.
I am using the following code in a draw callback. I also am using an Orthographic view to present a "God's Eye" view of the terrain.
glGetDoublev(GL_PROJECTION_MATRIX, projView);
glGetDoublev(GL_MODELVIEW_MATRIX, modelView);
glGetIntegerv(GL_VIEWPORT, view);
gluUnProject(winX, winY, winZ, modelView, projView, view, &objX, &objY, &objZ);
I would like to use the pfu routines but mouse processing is handled by another process and the winX and winY values are passed to me. I am using 0.0 for winZ because I am not given a value. objX and objY both contain appropriate values. The value for objZ is unreasonably large.
The above code works for objX and objY until I translate my viewpoint in Y. Translating in X works OK. I would like to use the pfu routines but mouse processing is handled by another process.
My questions:
1. Is this the proper way to convert from window coordinates to world coordinates?
2. What value should I use for winZ in the gluUnProject() call?
3. Can anyone point me to some sample code?
4. Am I missing something obvious?
Any ideas are greatly appreciated.
Thanks for your time
Kevin Kronmiller
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