From BlenderWiki
This sub-panel appears in the Editing Context panel group which is accessed using F9 or clicking
button in the Buttons window. This sub-panel is part of the Modifier parent panel. For further information about the common panel components see the Interface section on modifiers.
[edit] Decimator
- Ratio: - The percentage of Triangles to reduce to.
The Decimate Modifier is a quick and easy way of reducing the polygon count of a mesh non-destructively. This modifier demonstrates of the advantages of a mesh modifier system because it shows how an operation, which is normally permanent and destroys original mesh data, can be done interactively and safely using a modifier.
Unlike the majority of existing modifiers, the Decimate Modifier does not allow you to visualize your changes in edit mode.
The "Face Count:" field shows the number faces as a result of applying the Decimate Modifier.








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