On 05/25/2012 10:58 AM, tommyl...@eircom.net wrote: > Hi Kevin, > > I attach simple project that uses glu.lookat and rotates around a point on > the floor. Try it and tell if it's what you're looking for. > > Tomek
Yes, that's what I'm looking for. I boiled that program down to the up vector for Glu.LookAt() being computed by using the Sin() and Cos() of the angle for two of the vector components while leaving the third static. After finding the right values for the up vector I was able to make the program render the scene with zoom and rotation, however the camera is in the upper-left corner of the screen instead of at its center. The code and video that does that is here: ' Calculate offsets to center of screen. ScreenOffsetX = sWidth / 2 / 128 / Zoom.Current ScreenOffsetY = sHeight / 2 / 128 / Zoom.Current ' Increment test rotation. test += 0.01 ' Assign values to up vector. UpVec1 = Sin(test) UpVec2 = Cos(test) UpVec3 = 0 ' Scale the matrix. Gl.Scalef(128 * Zoom.Current, 128 * Zoom.Current, 1) ' Set the camera position and orientation. 'Glu.LookAt(Camera.WorldX + ScreenOffsetX, Camera.WorldY + ScreenOffsetY, 1, Camera.WorldX + ScreenOffsetX, Camera.WorldY + ScreenOffsetY, 0, UpVec1, UpVec2, UpVec3) Glu.LookAt(Camera.WorldX, Camera.WorldY, 1, Camera.WorldX, Camera.WorldY, 0, UpVec1, UpVec2, UpVec3) http://eightvirtues.com/sanctimonia/misc/X%20Marks%20the%20Wrong%20Spot.ogv Notice in the commented out Glu.LookAt() I have the screen offsets which center the scene on my camera (the X rendered on the map is the camera's world coordinates). When I include the screen offsets the rotation provided by Glu.LookAt() is using some other origin and not my camera. It appears as though the origin is the upper-left corner of the screen, and looks like this: http://eightvirtues.com/sanctimonia/misc/Screen%20Offset%20Fail.ogv I saw several posts stating that using Gl.Ortho() would allow the center of the screen to be used as the origin, but my implementations of it had no effect other than rendering nothing when the near and far clipping values were set to unequal values. Hopefully these details will inspire some sort of epiphany or insight, as I'm about to go crazy, haha. -- Kevin Fishburne Eight Virtues www: http://sales.eightvirtues.com e-mail: sa...@eightvirtues.com phone: (770) 853-6271 ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Gambas-user mailing list Gambas-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/gambas-user
