Suriya Prabha Sekar - 2019-02-26

Dear all,

I am working on 3D indoor modelling using 3DTK and I am new on this topic. I have a doubt in filtering horizontal planes. Can someone explain why this particular formula is used for determining the horizontal planes?

Horizontal planes if (1 - y/(sqrt(sqr(x) + sqr(y) + sqr(z))) < 0.1

Thanks,
Suriya