Is there any way to apply the texture to an object without specifying texture coordinates?
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Is there any way to apply the texture to an object without specifying texture coordinates?
In fixed-function OpenGL, you can generate texture coordinates by activating texture coordinate generation modes. There are a couple of fixed algorithms (spherical coordinates, reflection coordinates), and there is one that multiplies a vertex component by a 4×4 matrix to generate a texture coordinate.
In shaders, you can use anything you can algorithmically generate.
However, without telling us how you want a texture mapped to the surface, there’s no way to know if what you want is possible. There is no
glTextureMyObjectthat does “something”; either explicit texture coordinates must be used or some algorithm must generate them.