Get translated/rotated coordinates?

Graphics and GPU Programming Programming

Started by KeLi September 08, 2005 05:04 PM

2 comments, last by Mercury 18 years, 7 months ago

116

Author

September 08, 2005 05:04 PM

Hi! How can I retrieve the current coordinates after i've done a rotation or translation? If current coordinates is: 1.0f, 1.0f, 1.0f And when I rotate by 45 degrees in x-axis, I want to get the new coordinates. glPushMatrix(); glRotatef(45, 1.0f, 0.0f, 0.0f); glPopMatrix(); Sorry for my bad explanation. :)

Mercury

776

September 08, 2005 05:09 PM

You could retrieve the current modelview matrix from OpenGL and multiply your point by that matrix to get the new point that OpenGL will draw.

KeLi

116

Author

September 08, 2005 05:14 PM

How would I do this? I'm very n00b... :(

Mercury

776

September 08, 2005 05:22 PM

float matrix[16];glGetFloatv(GL_MODELVIEW_MATRIX, matrix);

From there, you multiply this matrix by your point, you can find out how to do this online.

edit: Here's how to multiply a point by a matrix.

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Get translated/rotated coordinates?

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