In-Class

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In-Class

A small in-class quiz/activity following our lecture. Goal is for you to understand the key takeaways from class!

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In regard to the 'point light' what is attenuation? *

1 point

This is the reduction in lighting over a distance. Typically we can model this realistically using a constant, linear, and quadratic factor multiplied by distance from the light source.

This is the increase in lighting over time.

When modeling a light in space, why do we have to compute the FragPos in our vertex shader?

1 point

We actually do not have to do this!

We need to figure out where our fragment is in the world so we can determine how much to light up our fragments based on a lights position. Thus, converting our FragPos to world space is necessary.

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What is a normal map?

1 point

It is a texture that encodes 'normal' information. Because it is in a texture image (i.e. sampler2D), we can encode more information (i.e. it is more information dense) than using the geometry of a model. Then we can use this texture to compute lighting on our surface, and often gain an illusion of depth and detail on models that would be computationally expensive using polygons.

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Why do we need (yet another!) matrix for normal mapping, i.e. the TBN Matrix?

1 point

Because we compute a normal map at a 'fixed view' we need someway to transform our normal map to handle lighting from different angles.

We do not need the TBN matrix.

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