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Texture Mapping -

Started by Jamazon Nov 24, 2001 at 3:42 PM 1 replies 350+ views

Original Post

Nov 24, 2001 at 3:42 PM

Hi I am new to opengl and have read some of the NeHe tutorials. I started making a small 3d demo using different textures and I noticed that the tuxture was always strecthed to fit the polygon it was put on. Say i had a bitmap that looked like a brick and wanted the brick to go on one side of the wall but not strecth - just repeat, making it look like a brick wall. How would I do this, has it got somethiingm to do with these 2 lines?: glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST); Thanks.

Fruny

Nov 24, 2001 at 3:45 PM

Nope, it's these two


glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );

The ones you gave control mipmapping.

Edit: cf Red Book p409

Edited by - Fruny on November 24, 2001 4:46:47 PM

Wavarian

Nov 24, 2001 at 4:36 PM

Um, i think you should be looking at the texture co-ords.

glTexCoord2f(0,0)
glTexCoord2f(1,0)
glTexCoord2f(1,1)
glTexCoord2f(0,1)

the above texture co-ordinates for a quad will make the texture stretch to fit the quad. Try changing the 1''s to 10''s and see how the texture is then tiled across the quad.

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