constant scale in viewport

Graphics and GPU Programming Programming

Started by smurfkiller May 06, 2008 07:28 AM

1 comment, last by V-man 15 years, 11 months ago

103

Author

May 06, 2008 07:28 AM

How do i make a object of constant size (in viewport) independent of view parameters like distance from camera and fov? For example like the transform gizmo in 3DSMax or Lightwave. I have managed to make it 'almost' independent based on camera distance: scale_xyz = some_constant / distance_from_camera. But how would i do it with fov?

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webwraith

239

May 13, 2008 06:59 AM

Sounds like you want an orthographic view, where the objects shown don't decrease in size the further away from the camera they get. Google "glOrtho", and give that a go

V-man

813

May 13, 2008 08:57 AM

You can try glhConstantSizeMatrixf2 or glhConstantSizeMatrixf from my glhlibrary
glhlibrary

It is intended to be used when you use a perspective projection.

Sig: http://glhlib.sourceforge.net
an open source GLU replacement library. Much more modern than GLU.
float matrix[16], inverse_matrix[16];
glhLoadIdentityf2(matrix);
glhTranslatef2(matrix, 0.0, 0.0, 5.0);
glhRotateAboutXf2(matrix, angleInRadians);
glhScalef2(matrix, 1.0, 1.0, -1.0);
glhQuickInvertMatrixf2(matrix, inverse_matrix);
glUniformMatrix4fv(uniformLocation1, 1, FALSE, matrix);
glUniformMatrix4fv(uniformLocation2, 1, FALSE, inverse_matrix);

constant scale in viewport

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constant scale in viewport

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