MeshUtilsCalculateNormals(Vector3, Int32, Vector3, Int32, Int32, Boolean) Method

public static void CalculateNormals(
	Vector3[] positions,
	int[] indices,
	Vector3[] normals,
	int startTriangleIndex,
	int indicesCount,
	bool normalize = true
)

Parameters

positions  Vector3

array of Vector3 that represents positions

indices  Int32

array of integers that represents triangle indices

normals  Vector3

array of Vector3 that represents normals - the values in this array will be filled with normal values. This array needs to be the same length or longer then the positions array

startTriangleIndex  Int32

index of the first triangle index to process (note that this is not triangle index but index in the indices array so the startTriangleIndex for the second triangle is 3)

indicesCount  Int32

number of triangle indices to process (to get indicesCount from the number of triangles multiply the number of triangle by 3)

normalize  Boolean  (Optional)

when true (by default), then the normals are normalized

Reference