What does Faceforward formula mean?

Name. faceforward - returns a normal as-is if a vertex's eye-space position vector points in the opposite direction of a geometric normal, otherwise return ...

faceforward orients a vector to point away from a surface as defined by its normal. If dot ( Nref , I ) < 0 faceforward returns N , otherwise it returns - N .

faceforward orients a vector to point away from a surface as defined by its normal. If dot ( Nref , I ) < 0 faceforward returns N , otherwise it returns - N .

2020年8月19日 — Flips the surface-normal (if needed) to face in a direction opposite to i; returns the result in n. ... This function uses the following formula: ...

Boost License 1.0. Generated using the DDOX documentation generator.

2022年11月21日 — A : -A means: -- If B points inwards (i.e. B•C < 0), keep A that way (even if A pointed inwards or outwards, doesn't care, keep it that way). -- ...

2023年10月18日 — Conditionally flips a vector n if two vectors i and ng are pointing in the same direction. Returns n if dot(i, ng) < 0, -n otherwise.

The faceforward function returns a vector that points in the same direction as a reference vector. The function has three input parameters of the type floating ...

2022年11月19日 — The description of Faceforward on Blender's manual page is: Orients a vector A to point away from a surface B as defined by its normal C.