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 ??

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MQH 2018-11-18

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评论： MQH 2018-11-19

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?

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Answer 1

Bruno Luong 2018-11-18

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https://ww2.mathworks.cn/matlabcentral/answers/430549-how-can-i-check-a-known-point-cooradinates-x-y-if-it-belongs-to-a-to-triangle-which-is-known-verti#answer_347623

编辑：Bruno Luong 2018-11-18

在 MATLAB Online 中打开

vx = [v1(1) v2(1) v3(1)]
vy = [v1(2) v2(2) v3(2)]
inpolygon(x,y,vx,vy)

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MQH 2018-11-19

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?

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