/*
	Common Part. Inputs and constants.

	Inputs
	--------
	Standard:
	v[0] == StartPos.	Hence, It is the SplitPoint of the father face.
	v[8] == Tex0 (xy) 
	v[9] == Tex1 (xy) (different meanings for Far and Tile).
	v[13] == Tex2 (xy) (just for Tile mode).

	Geomorph:
	v[10] == { GeomFactor, MaxNearLimit }
		* where GeomFactor == max(SizeFaceA, SizeFaceB) * OORefineThreshold.
		It's means vertices are re-computed when the RefineThreshold setup change.

		* MaxNearLimit= max(nearLimitFaceA, nearLimitFaceB)

	v[11].xyz == EndPos-StartPos

	Alpha: NB: Since only usefull for Far1, v[12] is not in the VB for Far0 and Tile VertexBuffer.
	v[12] == { TransitionSqrMin, OOTransitionSqrDelta}
		* TransitionSqrMin, OOTransitionSqrDelta : Alpha transition, see preRender().
			There is only 3 values possibles. It depends on Far1 type. Changed in preRender()


	Constant:
	--------
	Setuped at beginning of CLandscape::render()
	c[0..3]= ModelViewProjection Matrix.
	c[4]= {0, 1, 0.5, 0}
	c[5]= RefineCenter
	c[6]= {TileDistFarSqr, OOTileDistDeltaSqr, *, *}
	c[7]= ???
	c[8..11]= ModelView Matrix (for Fog).
	c[12]= PZBModelPosition: landscape center / delta Position to apply before multipliying by mviewMatrix


	Fog Note:
	-----------
	Fog is computed on geomorphed position R1.
	R1.w==1, and suppose that ModelViewMatrix has no Projection Part.
	Then Homogenous-coordinate == Non-Homogenous-coordinate.
	Hence we need only (FogVector*R1).z to get the FogC value.
	=> computed in just on instruction.
*/