**hi all,**

**1. A concise explanation of the problem you’re experiencing.**

Im making a application in which im using cesium geometric entities. like circle, polygon, polyline, . All in objects in 3D.

I need to find intersection points of line with circle or polygon. Line is drawn vertically up from ground (say 10 meters or 500 meters) and there is a rectangle/ circle or polygon drawn above ground (say 200 meters). how do i find the point of intersection on line.

**3. Context. Why do you need to do this? We might know a better way to accomplish your goal.**

Once I am able to find the point of intersection then I would say this line is permitted. if the line touchs or cross the rectangle then i’ll say this height is not permissible, and ask the line to be cut

**4. The Cesium version you’re using, your operating system and browser.**

Iam using cesium 1.63.

(sorry to ask lot of question… should i use any thing other than geometry elements ? )