CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

Is the 2D contour made only of vertices of the mesh? That is, was the
mesh refined toward that goal?
If not and if the mesh is coarse, you may end up selecting vertices far
from expected which might be two reason for the result you have.

Sebastien


On 08/17/2017 08:20 PM, SirM2X wrote:
> Sebastien,
>
> Thank you for your reply. The target position of each control vertex is the
> result of only translating the control vertex along some vector.
>
> To demonstrate our goal, I have attached two images below. Given a frontal
> view of the cactus (first image), we determine the object's silhouette and
> project into 2D. We then deform the 2D silhouette, to the silhouette shown
> in the second image, our goal is to deform the mesh in a way that it matches
> the deformed silhouette as best as possible. The 3D translation vector of
> each control vertex is determined by backprojecting the 2D deformation
> vector into 3D space, and intersecting the ray with a plane passing through
> the control vertex and oriented towards the camera.
>
> The whole idea is inspired by  this paper
> <https://www.cs.ubc.ca/~van/papers/2009-SBIM-contourDrawings.pdf>  .
> However, they are using  Mean-Value Geometry Encoding
> <https://pdfs.semanticscholar.org/726d/4edc8aef7880e16eb2b98f0ef82657b2bb0e.pdf>
> for mesh deformation. Since we are heavily using CGAL, we were hoping to be
> able to have a quick prototype ready by using CGAL's modules.
>
> <http://cgal-discuss.949826.n4.nabble.com/file/n4662943/cactus1.png>
>
> <http://cgal-discuss.949826.n4.nabble.com/file/n4662943/cactus-2.png>
>
>
>
> --
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