Realistic 3D models - Revision history

Jureslak: /* Working with 3D models in Medusa */

2020-11-19T10:31:31Z

Working with 3D models in Medusa

← Older revision		Revision as of 10:31, 19 November 2020
Line 71:		Line 71:

	The solution is shown below:		The solution is shown below:

	[[File:bunny-sol2.png\|496px]]		[[File:bunny-sol2.png\|496px]]

Jureslak: /* Working with 3D models in Medusa */

2020-11-19T10:31:16Z

Working with 3D models in Medusa

← Older revision		Revision as of 10:31, 19 November 2020
Line 37:		Line 37:
	[[File:bunny-surface.png\|400px]]		[[File:bunny-surface.png\|400px]]

			The <code>PolytopeShape</code> (a dimension independent version of <code>PolyhedronShape</code> and <code>PolygonShape</code>) can be used to work with OFF files. Otherwise, the solution procedure is as usual.

	<syntaxhighlight lang="c++" line>		<syntaxhighlight lang="c++" line>
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	fill(domain, dx);		fill(domain, dx);

	~~int N = domain~~.~~size();~~		... // The usual.
	~~domain~~.~~findSupport(FindClosest(25));~~
	~~RBFFD<Polyharmonic<double, 3>, Vec3d, ScaleToClosest> approx({}, 2);~~
	~~auto storage = domain~~.~~template computeShapes<sh::lap\|sh::d1>(approx);~~

	~~Eigen::SparseMatrix<double, Eigen::RowMajor> M(N, N);~~
	~~Eigen::VectorXd rhs(N); rhs~~.~~setZero();~~

	~~auto op = storage.implicitOperators(M, rhs);~~
	~~M.reserve(storage.supportSizes());~~

	for (int i : domain.interior()) {		for (int i : domain.interior()) {
Line 74:		Line 66:
	solver.compute(M);		solver.compute(M);
	ScalarFieldd u = solver.solve(rhs);		ScalarFieldd u = solver.solve(rhs);

	~~HDF hdf("bunny_poisson.h5", HDF::DESTROY);~~
	~~hdf.writeDouble2DArray("pos", domain.positions());~~
	~~hdf.writeEigen("sol", u);~~

	}		}
	</syntaxhighlight>		</syntaxhighlight>

			The solution is shown below:
	[[File:bunny-sol2.png\|496px]]		[[File:bunny-sol2.png\|496px]]

Jureslak: /* Working with 3D models in Medusa */

2020-11-19T10:28:52Z

Working with 3D models in Medusa

← Older revision		Revision as of 10:28, 19 November 2020
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	</syntaxhighlight>		</syntaxhighlight>

	[[File:bunny-sol2.png\|~~500px~~]]		[[File:bunny-sol2.png\|496px]]

Jureslak: /* Working with 3D models in Medusa */

2020-11-19T10:28:31Z

Working with 3D models in Medusa

@@ Line 36: / Line 36: @@
 [[File:bunny-surface.png|400px]]
 <syntaxhighlight lang="c++" line>
-#include <>
+#include <medusa/bits/domains/PolyhedronShape.hpp>  // This must be included separately.
 int main() {
+}
 </syntaxhighlight>
-[[File:bunny-sol.png|400px]]
+[[File:bunny-sol2.png|500px]]

Jureslak: Jureslak moved page Complicated 3D models to Realistic 3D models without leaving a redirect

2020-11-18T14:58:28Z

Jureslak moved page Complicated 3D models to Realistic 3D models without leaving a redirect

← Older revision	Revision as of 14:58, 18 November 2020
(No difference)

Jureslak: Jureslak moved page Complex 3D models to Complicated 3D models without leaving a redirect

2020-11-18T14:57:55Z

Jureslak moved page Complex 3D models to Complicated 3D models without leaving a redirect

← Older revision	Revision as of 14:57, 18 November 2020
(No difference)

Jureslak at 10:22, 16 November 2020

2020-11-16T10:22:01Z

← Older revision		Revision as of 10:22, 16 November 2020
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	Below is an example of colored bunny. The colors can be used to identify surface regions where different boundary conditions should be applied.		Below is an example of colored bunny. The colors can be used to identify surface regions where different boundary conditions should be applied.

	[[File:bunny-~~colored2~~.png\|400px]]		[[File:bunny-colored.png\|400px]]

	== Working with 3D models in Medusa ==		== Working with 3D models in Medusa ==

Jureslak at 10:06, 16 November 2020

2020-11-16T10:06:30Z

← Older revision		Revision as of 10:06, 16 November 2020
Line 25:		Line 25:
	Below is an example of colored bunny. The colors can be used to identify surface regions where different boundary conditions should be applied.		Below is an example of colored bunny. The colors can be used to identify surface regions where different boundary conditions should be applied.

	[[File:bunny-~~colored~~.png\|400px]]		[[File:bunny-colored2.png\|400px]]

	== Working with 3D models in Medusa ==		== Working with 3D models in Medusa ==

Jureslak: /* Working with 3D models in Medusa */

2020-11-12T18:43:06Z

Working with 3D models in Medusa

← Older revision		Revision as of 18:43, 12 November 2020
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	}		}
	</syntaxhighlight>		</syntaxhighlight>

			[[File:bunny-sol.png\|400px]]

Jureslak at 17:12, 12 November 2020

2020-11-12T17:12:04Z

← Older revision		Revision as of 17:12, 12 November 2020
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	We assume that an OFF file has been successfully obtained, in this example we will use the <code>bunny.off</code> file from [https://github.com/OpenGP/OpenGP/blob/master/data/bunny.off https://github.com/OpenGP/OpenGP/blob/master/data/bunny.off] that was colored as the picture above. To work with Medusa, we can make a generic <code>PolyhedronShape</code>, that can also be used with other existing shapes (translations, boolean operations, etc).		We assume that an OFF file has been successfully obtained, in this example we will use the <code>bunny.off</code> file from [https://github.com/OpenGP/OpenGP/blob/master/data/bunny.off https://github.com/OpenGP/OpenGP/blob/master/data/bunny.off] that was colored as the picture above. To work with Medusa, we can make a generic <code>PolyhedronShape</code>, that can also be used with other existing shapes (translations, boolean operations, etc).

	This is done by inheriting from <code>DomainShape</code> and defining the required methods. Notably, CGAL is use to get a proper implementation of <code>contains</code> method, that is needed for filling the domain. CGAL is also used to get the bounding box, and to store the surface mesh in an easily traversable data structure.		This is done by inheriting from <code>DomainShape</code> and defining the required methods. Notably, CGAL is use to get a proper implementation of <code>contains</code> method, that is needed for filling the domain. CGAL is also used to get the bounding box, and to store the surface mesh in an easily traversable data structure. Note that the polyhedron, represented in the OFF file is considered to be the exact domain, which is then discretize with meshless techniques. The mesh is used only to define the domain, and is considered fixed and final. Discretizations can (and usually should) be smaller than.

			Below is a picture of the bunny OFF model with surface nodes of various types, as defined by the face colors, along with the surface normals.

			[[File:bunny-surface.png\|400px]]