Question about triangle face direction

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Peter Scheutz
 #1
Put your triangle at 0,0,0
Put your camera at 0,0,-10

make your camera look at 0,0,0

now you are on the negative z axis looking at an xy plane.
y positive is up

this tri is cw:
(-1,0,0) - (0,1,0) - (1,0,0)

this tri is ccw:
(-1,0,0) - (0,-1,0) - (1,0,0)
Open in online IDE
Graphics3D 500,500,0,2

cam = CreateCamera()
PositionEntity cam , 0,0,-2
m=CreateMesh()

PointEntity cam,m

s = CreateSurface(m)

v0 = AddVertex(s,-1,0,0)
v1 = AddVertex(s,0,Sqr(2),0)
v2 = AddVertex(s,1,0,0)

;cw:
AddTriangle s,v0,v1,v2

;ccw:
;AddTriangle s,v0,v2,v1

While Not KeyHit(1)
	RenderWorld 
	Flip
Wend