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et17

Do manifold surfaces have an existing normal vector at all points? compared to not manifold surfaces?

kbeache

how is this possible if there are multiple tangent lines given a surface. Especially for complex ones

tulum

Here is the soft/hard vertex normals in Maya when things became complicated.

yilong_new

@et17 The surface should be at least differentiable in order to calculate the normal (though I think in this course we assume all surfaces are smooth manifold?)