Why my texture is not showing PyOpenGL

Question

I tried everything but still I don\'t get my error. I am trying to put a texture on my sphere object.

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Minimal texture on sphere demo
This is demo for          


        

Answer 1

In read_texture() after you generate a texture name you don't bind it. So the subsequent texture related calls are going to the default texture and not your newly created texture.

texture_id = glGenTextures(1)
glBindTexture(GL_TEXTURE_2D, texture_id) # This is what's missing

Also since your image is a PNG image. Then list(img.getdata()) will be a list of tuples containing (R, G, B, A). So when calling glTexImage2D you need to tell that your data is GL_RGBA and not GL_RGB.

glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, img.size[0], img.size[1], 0,
             GL_RGBA, GL_UNSIGNED_BYTE, img_data)

You can also automate it.

format = GL_RGB if img.mode == "RGB" else GL_RGBA
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, img.size[0], img.size[1], 0,
             format, GL_UNSIGNED_BYTE, img_data)

You can also convert it to not have an alpha channel.

img = img.convert("RGB")

Which of course needs to be done before calling img.getdata().

Now you should see the following:

Also an important note. You're calling read_texture() in draw_sphere(). This means that every time draw_sphere() is called, the image is loaded and a new texture is created. You really don't want to do that. Instead before calling glutMainLoop() call read_texture() and store the result as a global name.