Optimizing a scene, Part 1. Shapes, Instances and the Replace Selected Function

This tutorial shows the basics of using shapes and instances as it relates to replacing existing items with instances of a shape. This is very useful for optimizing a scene that has many repeating elements
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Modeling Lipstick, Part 4

This is a follow-up tutorial (to Part 3 here) dealing with rendering spline-based objects as polygons when the object has a transparent and refractive material. It shows how to adjust the object to get the best possible appearance.
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