[vtkusers] AREA & VOLUME ?
JohnMark
zhaojunxp at hotmail.com
Mon Sep 3 21:58:12 EDT 2007
Hi , vtkusers ,
My friends ask me how to compute the area or volume of vtk rendering object . My thought is :
1 . we know , if the region , which would be computed , is regular , the computation will be
easy . in fact , however , what we have to compute are always arbitrary polygons . there are several
methods : we can divide it into several triangles , computing each triangle's area and then sum
them up . but there is a precondition : the polygon have few points . the more points , the more
difficult it is .
Is there any filters that can compute the arbitrary polygon's area ? I test it in vtkMath , but
it just performs common math operations .
or , if there is not such a filter , I think it would be better to writer such a class , because
it will be used widely , like geology and so on .
2 . if we reconstruct a arbitrary 3D object , maybe we want to get its volume . I have been
thinking we can compute it by voxels ,because the voxel is regular , then we can compute it . but I
could not get the number of voxels in 3D object . I can only get the number of cells , but it would
not help me .
so , if we want to compute volume , what filters we can use ?
thank you with great regards !
Mark
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