Phong Shading giving a black line

[orange451]

My only "advice" is to look in to how you create your diffuse variable in the shader. You are doing something incorrect when calculating it. It appears as though all the vertices/normals are being passed in properly.

[Slyth2727]

Think of it in a mathematical sense, not from a coding perspective. Step through all the different mathematical operations and make sure that they make sense. If you don't know what one line does, figure it out. This will make sure that you know exactly what's going on and you will start to see where stuff could go wrong.

[Spacebeans]

Think of it in a mathematical sense, not from a coding perspective. Step through all the different mathematical operations and make sure that they make sense. If you don't know what one line does, figure it out. This will make sure that you know exactly what's going on and you will start to see where stuff could go wrong.

I know most about what it does (Normals, Vectors, and Interpolation), but not all of it. I've looked this code over plenty of times, and it should be working... I've tried everything I could think of...

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[thedanisaur]

It's been a while since I've written a Phong shader, but I'm curious what happens if you change the light color from 100, 100, 100, to 1.0, 1.0, 1.0

[Spacebeans]

change the light color from 100, 100, 100, to 1.0, 1.0, 1.0

I tried that a while ago, It just gave me the same result, but the black-face just faded out slower during movement than before.