So I am facing a problem with the camera and Particular, I track the finger of my friend and my goal is that it is realistic but when i applique particular etc etc, the particule are like in 2D and not 3D how to explain, i want the particule passes in front of the camera unfortunately the particule stay in the video like incrust.
Here are some images to better understand my problem and sorry for my english... i'm a french guy ah ah.
I am not really sure what you are asking. If you are tracking your friends finger using the 2d tracker in after effects, you will only be getting information relating to x and y, not z. It looks like in the third pic, you have some depth of field applied. Integrating particles into live motion works best when there is some interaction between the talent and the effect. You can rotoscope her hand to be infront of the particles and better integrate them into the scene. Other than that, can you explain a little more clearly what you are trying to achieve?