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📗 [1 points] Which of the following variable types (or variables) are used in the vertex shader? uniform attribute varying gl_Position gl_FragColor None of the above.
📗 [1 points] Which of the following variable types (or variables) are used in the fragment shader? uniform gl_FragColor varying gl_Position attribute None of the above.
📗 [1 points] What is viewMatrix * vec4(cameraPosition, 1.0) in the vertex shader? vec4(0.0, 0.0, 0.0, 1.0) vec4(1.0, 1.0, 1.0, 1.0) vec4(position, 1.0) vec4(cameraPosition - position, 1.0) vec4(position - cameraPosition, 1.0) None of the above.
📗 [1 points] Which ones of the following evaluates to 0.0 in the shader? step(t, x) means x < t ? 0.0 : 1.0. step(0.75, 0.5) step(1.0, 0.5) step(0.5, 0.5) step(0.25, 0.5) step(0.0, 0.5) None of the above.
📗 [1 points] Given mesh = new THREE.Mesh(geometry, material) with material = new THREE.ShaderMaterial({uniforms ...}), where does the vertex shader get values for attribute vec3 color? geometry.getAttribute("color") material.color mesh.getAttribute("color") mesh.color material.uniforms.color None of the above.
📗 [1 points] Which of the following compute the cosine of the angle between a = vec3(1.0, 0.0, 0.0) and b = normalize(vec3(1.0, 1.0, 0.0))? dot(a, b) dot(b, a) -dot(b, a) cos(atan(b / a)) cos(atan(a \ b)) None of the above.
📗 [1 points] If the cosine of the angle between the camera position and the reflected light direction is cos(theta) = -1 and the Phong coefficient or shininess is p = 3. What is the intensity of the specular light? Note: the intensity is calculated by pow(clamp(cos(theta), 0.0, 1.0), p). 0.0 1.0 -1.0 3 -3 None of the above.
📗 [1 points] 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)? vec3(viewMatrix * vec4(lp, 1.0)) viewMatrix * lp normalMatrix * lp vec3(projectionMatrix * viewMatrix * vec4(lp, 1.0)) projectionMatrix * viewMatrix * lp None of the above.
📗 [1 points] Please provide additional comments, questions, or feedback:
📗 [1 points] Why are you submitting this survey? Did not attend one or both of the lectures this week. Attended both lectures but missed some questions on TopHat. Attended the lectures but TopHat did not work. Want to submit anonymous feedback.
Note: if you selected the third (please also email me) or forth choice, you only have to complete the last question.