Preface. (A little something about creating your own rotoscopes.)
"Why doesn't my 3d render look like the picture I used as a reference?"
Sound familiar? (if not.... then feel free to move on to step one).
Rotoscopes are very handy things when it comes to modeling. They are the modeling equivalent to tracing in drawing. That said.. if your rotoscopes don't have the right "stuff" then your model probably won't either. What is the right "stuff"? Glad you asked...
Simply put when it comes to rotoscopes, it would be really handy if the world had no perspective. Of course that's not the case, so we are left to figure out the differences when we model. However there are things we can do that can take as much perspective as possible out of our rotoscopes.
You probably wonder why I worry so much about real world perspective.... "what's the big deal" right? Well it has to do with the fact that you model in a window that has no perspective. true its "3d" but the viewing angle is "orthographic". Yes you can toggle this view to perspective, but it is not advisable to try to model with this perspective turned on. things become harder to position correctly. Its a very subtle thing, but it can make a difference when it comes to modeling. Faces get fatter, longer, you name it...
As much as you want to don't get your camera right up in the face of your model... Camera's have wide angle lenses This will introduce artificially inflated perspective. Add to that the perspective that will get added when you take the model based on these unnaturally "fat" rotoscopes into a view with a perspective camera and the results are... "chipmunk cheeks", "Neanderthal foreheads".
So step away from your model as far back as you can get. Better yet get a telephoto lens and keep on backing up.... further.... fuurrrrther. There. OK now how do you model a face that will have all of 3 pixels of detail to model from? If you are asking that you backed up to far.
The point is that in order to make a good rotoscope you'll need a good camera (i.e... lots of megapixels). Shoot it in good "even" lighting, against a dark background if the model is light skinned and a light background if the model is dark skinned. And try as much as you can to eliminate perspective by getting as far back as possible (but still close enough to capture detail).
You will also want to make the rotoscope dark by tinting it with some dark color that contrasts with the shading used in the 3d program. I just tinted mine with a dark gray-green color to match the Animation Master default background. This allows me to see my splines well against the rotoscope.
Finally if you don't have a camera to photograph rotoscopes with... draw them. Even if you cant draw, draw something and us it. Its a lot harder to get it right in a 3d environment if you don't have a road map to work from.
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