Help Capturing Points in Space

[FrancoisStudent]

Hi Guys Maybe i am asking a stupid question but i have to ask if i don't know.

What type of electrical sensor will i use if i want to capture a point in open space.

Lets say i have 4 points (Sensors) in a line 5 inch apart and i want to capture it via a Computer like they do with 3d.

I have searched he net and there is 1000 of different sensors and i don't know what that sensor is called.

Is there another way to capture points. The point will be stationary not moving.

Sorry for the newbie question.

 

[chuckey]

" i want to capture a point in open space " , what sort of point?, how will you recognise it?. Will it provide an echo to radar (SHF or ultra sonic) or an image (TV camera), has it high reflectance?. . . .
Frank