Hi im in houdini with a geometry that has a texture.

i render with a camera that has transform information such as translate, rotate, also the pixel aspect, focal lenght and aperture etc

i render in 1920 x 1080

if i know the geometry points position in the 3d scene, how can i calculate in which coordenates in 2D 1920x1080 those points gonna finish at?

Depending on what context you need to compute the screen coordinates, you can use these functions/vops:

http://www.sidefx.com/docs/houdini/vex/functions/toNDC [www.sidefx.com]
https://www.sidefx.com/docs/houdini/nodes/vop/tondc [www.sidefx.com]
https://www.sidefx.com/docs/houdini/nodes/vop/tondcgeo [www.sidefx.com]

and to go the other way:
http://www.sidefx.com/docs/houdini/vex/functions/fromNDC [www.sidefx.com]
https://www.sidefx.com/docs/houdini/nodes/vop/fromndc [www.sidefx.com]
https://www.sidefx.com/docs/houdini/nodes/vop/fromndcgeo [www.sidefx.com]

sweet thank you