设备和模拟器上的底纹不同

Question

I have a GLKViewController embedded in a regular view controller displaying a spinning 3D model of one of my company's products. I am using the same code in a different app to display another model and I have no problems with that one.

For some reason, when I run my current app on the simulator I get perfectly fine smooth shading as expected, but when I run on a device (I have tested on both an iPad 3 and iPad 4), I get what appears to be cell-shading, as though the lighting values are more discrete.

The real confusion is that this only happens when running on a device, and only to this particular model, not any of the others I have used.

Is there a known bug in GLSL that could cause this behavior?

EDIT

Interestingly enough, during my debugging, if I change

gl_FragColor = vec4(ambientColor.rgb + diffuseReflection + specularReflection, 1.0);

to

gl_FragColor = vec4(diffuseReflection, 1.0);

I get my desired output, but when I output each component, the remaining components all show up as just black, which shouldn't cause that strange shading behavior.

Answer 1

Have you checked the filenames of your vertex and fragment shaders?

If you have a file named: "vertexShader.vert" and try and reference it using "VertexShader.vert" (note the capitalisation), this will work on the Simulator, but not on the device.