How can I check a known point cooradinates (x,y) if it belongs to a to Triangle which is known vertices coordinates v1,v2,v3 ??

I have a coordinates of point x ,y and I have coordinates of vertices of each triangle v1 ,v2 ,v3 . How can I check if one of the point belongs to a triangle?

Answer 1

[Bruno Luong]

vx = [v1(1) v2(1) v3(1)]
vy = [v1(2) v2(2) v3(2)]

inpolygon(x,y,vx,vy)

[MQH]

Thanks for your help.

I have another question because. I have vertecies with xyz 'maybe z not importantand' and I have faces and I have an segmented image binary black or whit.

How can I know if the faces belongs to the segmented area(also georeferenced image) for examlpe only white one??

- Or To make it simple How I know if the faces belong to an segmented area or polygon maybe?