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I cannot seem to understand how texture coordinates work. I try to render a texture into two triangles and this is what I get

enter image description here

Where the expected output is a normal continuous image as you can imagine.

Triangles coordinates (where w = 1080, h = 1920):

0, 0, w, 0, 0, h, w, 0, 0, h, w, h

Texture coordinates

0, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0

Texture parameters

gl.glTexEnvf(GL10.GL_TEXTURE_ENV, GL10.GL_TEXTURE_ENV_MODE, GL10.GL_REPLACE); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_LINEAR); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_S, GL10.GL_CLAMP_TO_EDGE); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_T, GL10.GL_CLAMP_TO_EDGE);
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  • \$\begingroup\$ The fact that the moon/planet doesn't look spherical to me seems to suggest that you might have perspective correct texturing turned on but haven't set the "W" (and I don't mean your width value) set correctly. \$\endgroup\$ Commented Jun 7, 2018 at 10:40
  • \$\begingroup\$ @SimonF updated the question adding used texture parameters. I tried using REPEAT instead of CLAMP_TO_EDGE but this hasn't changed the output. \$\endgroup\$ Commented Jun 7, 2018 at 11:40

1 Answer 1

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Take a piece of paper and draw your 2 triangles vertices coords and uv coords. They seem to be misplaced (e.g. 0,h corresponds one time to 0,0 and other time to 1,0)

For such cases I could also recommend to use textures with clearly defined characteristics, e.g. a checkerboard with marked uv coords:

enter image description here

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  • \$\begingroup\$ Thanks, your answer made me think in a right direction and google the UV picture again. Now I get it. The correct sequence for my scenario is 0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 0. \$\endgroup\$ Commented Jun 7, 2018 at 17:59

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