Vector Coordinates

FERNANDO-BRASIL · 2002-06-06T12:07:52

Hi guys, bear with me! I''m not very good on math... And I have a big problem... I''m trying to make my own function of OPENGL gluProject and I''m passing trough hard days until now... The gluProject function, converts a object vector coordinates to screen coordinates. In OpenGL Red Book, they say I have to do this: v'' = ProjectionMatrix * ModelViewMatrix * v where v = [objectX, objectY, objectZ, 1] after this, to get the window 2d coordinates, you have to do the following (let''s say the resolution is at 640x480): winX = (640 * v(objectX) + 1) / 2 winY = (480 * v(objectY) + 1) / 2 winZ = (v(objectZ) + 1) / 2 So, I did everything described there, and the final results is still having wrong values... What Do I have to do? Is something missing? Thank you a lot guys! Any help will be apreciatted. Fernando

Math and Physics Programming

Started by FERNANDO-BRASIL June 03, 2002 08:27 PM

9 comments, last by FERNANDO-BRASIL 21 years, 10 months ago

FERNANDO-BRASIL

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June 06, 2002 12:07 PM

Thank you LilBudyWiser! You were right! I took a look at my code, made some tests, and have seen that the results of MATRIX * VECTOR was giving me wrong results. Then, I swapped collum by row, and now it''s working fine!

But the transformation isn''t working yet...

I''m very tired with this, but I''ll continue trying....

So, I think I don''t have anything to ask anymore because all that I had to ask I asked, and it seems that this is the end of this thread... (but, if anyone has good opinions, you are welcome...)

Thank you a lot LilBudyWiser!

Fernando

Vector Coordinates

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Vector Coordinates

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