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Probleme Suivi de la camera 3D

New Here ,
Mar 07, 2023 Mar 07, 2023

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Bonjour,

 

Lorsque je fais un suivi de camera 3D sur un plan de 3minutes, le calcul s'arrete à un moment et ne repart plus...  parfois à 40% parfois à 20% parfois 50%. Je n'arrive pas à aller au bout. J'ai redemmaré l'ordi, j'ai tout essayé, je ne comprend pas pourquoi ça bloque. 

 

Avez-vous une idée? SVP

 

Maxime

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Freeze or hang

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Community Expert ,
Mar 07, 2023 Mar 07, 2023

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The first question I have to ask is, "Will the entire 3-minute shot be included in the final edit of your project?"

If the answer is no, then pre-edit your shot so that you are not spending time on parts of the shot that will not be seen.

 

A common cause of tracker failure is a lack of system resources. Another thing that can foul up the camera tracking is too much moving geometry in the shot. Hand-holding a camera while walking down a New York Sidewalk at lunchtime with hundreds of people moving in and out of frame will almost always fail because there is not enough fixed geometry in the shot for the camera tracker to calculate the camera movement.  Walking down a beach with the surf crashing or flying a drone over a beach can also be problematic because of the lack of detail in the sand and the constantly changing water and waves. Camera tracking a shot from a boat or a moving camera through a wheat field when the wind is blowing is also going to be a problem because everything but the horizon is moving, and so is the camera. 

 

More than 90% of the shots that I camera track have been shot with camera tracking in mind, and most of them are only a few seconds long because most shots in the films I produce are seven seconds or less. On the rare occasion that I need to camera track a long shot, I often split up the shot into shorter segments and try and find some matching geometry in the shot that I can use for a match cut between cameras. 

 

Show us the shot, or at least describe it, and we might be able to help you figure out a more efficient solution.

 

This shot would be nearly impossible to track:

ctProblem.gif

It might camera-solve, but the moving water, lack of detail in the sand, and the reflections would foul up any tracking data and make the camera track useless.

 

 

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