openGl alpha(blend) from luma image?


    Feb 20 2006 | 2:56 am
    hi..
    i have a luma image with a black and white pattern and want to map this on a opengl obj... it works so far... but i want to have the black pixels beeing transparent so the object is transparent where the texture is black... i tried blend in openGL but i think i'm using the wrong image format with luma... how can i get a suitable alphachannel from the black pixels of the texture for the object to use it for "blend" purposes?
    thank you for your great support and help...
    can't sleep :-) peter

    • Feb 20 2006 | 3:22 am
      Generate the alpha channel with jit.lumakey or jit.chromakey @mode 2. Or any similar operation using jit.unpack->jit.op/jit.charmap- >jit.pack, et cetera.
      -Joshua
    • Feb 20 2006 | 3:32 am
      You can also use jit.gl.texture @colormode lumalpha to texture your object.
      wes
    • Feb 20 2006 | 7:48 am
      > You can also use jit.gl.texture @colormode lumalpha to texture your > object.
      Wes, you saved my life, made my date and make me cry of joy.
      OpenGL is such a great very very high level programming language... therefore, so much to learn!
      pa