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Lecture notes of the week: W12



# QS12: Week 12 Survey Questions

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📗 [1 points] In the fragment shader, which of the following expressions evaluate to 0.0?





None of the above.
📗 [1 points] In the fragment shader, which of the following expressions evaluate to 1.0?





None of the above.
📗 [1 points] If the following functions are sampled at t = 0, 1, 2, which ones will be aliases of (i.e. have the same sampled values as) Math.sin(t * Math.PI)?





None of the above.
📗 [1 points] In a fragment shader, if the value of v at the current pixel is 1.0 and the value of v at the pixel on the left is -1.0, on the right is 3.0, above the pixel is -2.0 and below the pixel is 4.0, which of the following are possible values of dFdx(v)? Assume the pixel to the left of the current pixel has a smaller x value.





None of the above.
📗 [1 points] In a fragment shader, if the value of v at the current pixel is 1.0 and the value of v at the pixel on the left is -1.0, on the right is 3.0, above the pixel is -2.0 and below the pixel is 4.0, which of the following are possible values of dFdy(v)? Assume the pixel above the current pixel has a smaller y value.





None of the above.
📗 [1 points] In the fragment shader, if dFdx(v) is 2.0 and dFdy(v) is -2.0, what is fwidth(v)?





None of the above.
📗 [1 points] [Correction] Which of the following lines transform the position of the light lp = vec3(1.0, 1.0, 1.0) in the scene coordinates to the camera coordinates in the vertex shaders (so that the light does not move with the camera)?
📗 Note: the answer is vec3(viewMatrix * vec4(lp, 1.0)), there is no need to multiply modelMatrix since the transformation for the vertices does not apply to the light position.





None of the above.
📗 [1 points] [Correction, last week's question was not clear] Which ones of the following evaluates to 1.0 in the shader? step(t, x) means x < t ? 0.0 : 1.0.





None of the above.
📗 [1 points] Please provide additional comments, questions, or feedback: 

📗 [1 points] Why are you submitting this survey?




Note: if you selected the third (please also email me) or forth choice, you only have to complete the last question.





Last Updated: September 11, 2025 at 10:55 PM