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MeshHelperTest.cs
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MeshHelperTest.cs
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// MonoGame - Copyright (C) MonoGame Foundation, Inc
// This file is subject to the terms and conditions defined in
// file 'LICENSE.txt', which is part of this source code package.
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Content.Pipeline.Graphics;
using NUnit.Framework;
namespace MonoGame.Tests.ContentPipeline
{
public class MeshHelperTest
{
private readonly BasicMaterialContent material1 = new BasicMaterialContent
{
Name = "Material1",
Alpha = 0.5f,
DiffuseColor = Color.Red.ToVector3(),
VertexColorEnabled = true,
};
private readonly BasicMaterialContent material2 = new BasicMaterialContent
{
Name = "Material2",
Alpha = 0.5f,
DiffuseColor = Color.Blue.ToVector3(),
VertexColorEnabled = true,
};
[Test]
public void TestMergePositions()
{
var mb = MeshBuilder.StartMesh("Test");
mb.SetMaterial(material1);
mb.CreatePosition(new Vector3(0f, 0f, 0f));
mb.CreatePosition(new Vector3(4f, 4f, 4f));
mb.CreatePosition(new Vector3(-1f, -1f, -1f));
mb.AddTriangleVertex(0);
mb.AddTriangleVertex(1);
mb.AddTriangleVertex(2);
var mesh = mb.FinishMesh();
Assert.AreEqual(3, mesh.Positions.Count);
MeshHelper.MergeDuplicatePositions(mesh, 5f);
Assert.AreEqual(2, mesh.Positions.Count);
var geom = mesh.Geometry[0];
Assert.AreEqual(3, geom.Vertices.Positions.Count);
Assert.AreEqual(3, geom.Vertices.PositionIndices.Count);
Assert.AreEqual(0, geom.Vertices.PositionIndices[0]);
Assert.AreEqual(1, geom.Vertices.PositionIndices[1]);
Assert.AreEqual(0, geom.Vertices.PositionIndices[2]);
}
[Test]
public void TestNormalGeneration()
{
var mb = MeshBuilder.StartMesh("Test");
// A 5x5 grid of points around the origin, with the centerpoint raised a bit.
mb.CreatePosition(new Vector3(-2, 0, -2));
mb.CreatePosition(new Vector3(-1, 0, -2));
mb.CreatePosition(new Vector3( 0, 0, -2));
mb.CreatePosition(new Vector3(+1, 0, -2));
mb.CreatePosition(new Vector3(+2, 0, -2));
mb.CreatePosition(new Vector3(-2, 0, -1));
mb.CreatePosition(new Vector3(-1, 0, -1));
mb.CreatePosition(new Vector3( 0, 0, -1));
mb.CreatePosition(new Vector3(+1, 0, -1));
mb.CreatePosition(new Vector3(+2, 0, -1));
mb.CreatePosition(new Vector3(-2, 0, 0));
mb.CreatePosition(new Vector3(-1, 0, 0));
mb.CreatePosition(new Vector3( 0,0.5f,0)); // The bump in the center.
mb.CreatePosition(new Vector3(+1, 0, 0));
mb.CreatePosition(new Vector3(+2, 0, 0));
mb.CreatePosition(new Vector3(-2, 0, +1));
mb.CreatePosition(new Vector3(-1, 0, +1));
mb.CreatePosition(new Vector3( 0, 0, +1));
mb.CreatePosition(new Vector3(+1, 0, +1));
mb.CreatePosition(new Vector3(+2, 0, +1));
mb.CreatePosition(new Vector3(-2, 0, +2));
mb.CreatePosition(new Vector3(-1, 0, +2));
mb.CreatePosition(new Vector3( 0, 0, +2));
mb.CreatePosition(new Vector3(+1, 0, +2));
mb.CreatePosition(new Vector3(+2, 0, +2));
// Create triangles like this, starting with the quad in the bottom left, then
// bottom right, then top left, then top right, doing the bottom/right-most triangle
// first in each quad.
// 20--21--22--23--24
// | / | / | / | / |
// 15--16--17--18--19
// | / | / | / | / |
// 10--11--12--13--14
// | / | / | / | / |
// 5---6---7---8---9
// | / | / | / | / |
// 0---1---2---3---4
// In this diagram, horizontal is the x-axis, vertical is the z-axis, and the y-axis
// comes out of the screen.
void AddTriangle(int a, int b, int c) { mb.AddTriangleVertex(a); mb.AddTriangleVertex(b); mb.AddTriangleVertex(c); }
AddTriangle( 0, 1, 6); AddTriangle( 0, 6, 5);
AddTriangle( 1, 2, 7); AddTriangle( 1, 7, 6);
AddTriangle( 2, 3, 8); AddTriangle( 2, 8, 7);
AddTriangle( 3, 4, 9); AddTriangle( 3, 9, 8);
AddTriangle( 5, 6, 11); AddTriangle( 5, 11, 10);
AddTriangle( 6, 7, 12); AddTriangle( 6, 12, 11);
AddTriangle( 7, 8, 13); AddTriangle( 7, 13, 12);
AddTriangle( 8, 9, 14); AddTriangle( 8, 14, 13);
AddTriangle(10, 11, 16); AddTriangle(10, 16, 15);
AddTriangle(11, 12, 17); AddTriangle(11, 17, 16);
AddTriangle(12, 13, 18); AddTriangle(12, 18, 17);
AddTriangle(13, 14, 19); AddTriangle(13, 19, 18);
AddTriangle(15, 16, 21); AddTriangle(15, 21, 20);
AddTriangle(16, 17, 22); AddTriangle(16, 22, 21);
AddTriangle(17, 18, 23); AddTriangle(17, 23, 22);
AddTriangle(18, 19, 24); AddTriangle(18, 24, 23);
MeshContent meshContent = mb.FinishMesh();
// The MergeDuplicateVertices code has reordered these (without merging anything,
// since they're all different positions), and the new numbering is the order they
// appeared in the actual indexing:
// 21--20--22--23--24
// | / | / | / | / |
// 16--15--17--18--19
// | / | / | / | / |
// 11--10--12--13--14
// | / | / | / | / |
// 3---2---5---7---9
// | / | / | / | / |
// 0---1---4---6---8
// At this point, the positions are now reordered, but we can assert that their positions
// are right.
var vertexPositions = meshContent.Geometry[0].Vertices.Positions;
Assert.AreEqual(new Vector3(-2, 0, -2), vertexPositions[ 0]);
Assert.AreEqual(new Vector3(-1, 0, -2), vertexPositions[ 1]);
Assert.AreEqual(new Vector3(-1, 0, -1), vertexPositions[ 2]);
Assert.AreEqual(new Vector3(-2, 0, -1), vertexPositions[ 3]);
Assert.AreEqual(new Vector3( 0, 0, -2), vertexPositions[ 4]);
Assert.AreEqual(new Vector3( 0, 0, -1), vertexPositions[ 5]);
Assert.AreEqual(new Vector3(+1, 0, -2), vertexPositions[ 6]);
Assert.AreEqual(new Vector3(+1, 0, -1), vertexPositions[ 7]);
Assert.AreEqual(new Vector3(+2, 0, -2), vertexPositions[ 8]);
Assert.AreEqual(new Vector3(+2, 0, -1), vertexPositions[ 9]);
Assert.AreEqual(new Vector3(-1, 0, 0), vertexPositions[10]);
Assert.AreEqual(new Vector3(-2, 0, 0), vertexPositions[11]);
Assert.AreEqual(new Vector3( 0,0.5f,0), vertexPositions[12]);
Assert.AreEqual(new Vector3(+1, 0, 0), vertexPositions[13]);
Assert.AreEqual(new Vector3(+2, 0, 0), vertexPositions[14]);
Assert.AreEqual(new Vector3(-1, 0, 1), vertexPositions[15]);
Assert.AreEqual(new Vector3(-2, 0, 1), vertexPositions[16]);
Assert.AreEqual(new Vector3( 0, 0, 1), vertexPositions[17]);
Assert.AreEqual(new Vector3(+1, 0, 1), vertexPositions[18]);
Assert.AreEqual(new Vector3(+2, 0, 1), vertexPositions[19]);
Assert.AreEqual(new Vector3(-1, 0, 2), vertexPositions[20]);
Assert.AreEqual(new Vector3(-2, 0, 2), vertexPositions[21]);
Assert.AreEqual(new Vector3( 0, 0, 2), vertexPositions[22]);
Assert.AreEqual(new Vector3(+1, 0, 2), vertexPositions[23]);
Assert.AreEqual(new Vector3(+2, 0, 2), vertexPositions[24]);
var normalsChannel = meshContent.Geometry[0].Vertices.Channels.Get<Vector3>(VertexChannelNames.Normal());
// All of the points around the edge should be pointed up. Some of the ones on the interior will be affected
// by the center point being shifted up, so we won't check those.
Assert.AreEqual(Vector3.UnitY, normalsChannel[ 0]);
Assert.AreEqual(Vector3.UnitY, normalsChannel[ 1]);
Assert.AreEqual(Vector3.UnitY, normalsChannel[ 4]);
Assert.AreEqual(Vector3.UnitY, normalsChannel[ 6]);
Assert.AreEqual(Vector3.UnitY, normalsChannel[ 8]);
Assert.AreEqual(Vector3.UnitY, normalsChannel[ 9]);
Assert.AreEqual(Vector3.UnitY, normalsChannel[14]);
Assert.AreEqual(Vector3.UnitY, normalsChannel[19]);
Assert.AreEqual(Vector3.UnitY, normalsChannel[24]);
Assert.AreEqual(Vector3.UnitY, normalsChannel[23]);
Assert.AreEqual(Vector3.UnitY, normalsChannel[22]);
Assert.AreEqual(Vector3.UnitY, normalsChannel[20]);
Assert.AreEqual(Vector3.UnitY, normalsChannel[21]);
Assert.AreEqual(Vector3.UnitY, normalsChannel[16]);
Assert.AreEqual(Vector3.UnitY, normalsChannel[11]);
Assert.AreEqual(Vector3.UnitY, normalsChannel[ 3]);
}
[Test]
public void TestMergePositionsMultipleGeometries()
{
var mb = MeshBuilder.StartMesh("Test");
mb.CreatePosition(new Vector3(0f, 0f, 0f));
mb.CreatePosition(new Vector3(1f, 1f, 1f));
mb.CreatePosition(new Vector3(2f, 2f, 2f));
mb.CreatePosition(new Vector3(0f, 0f, 0f));
mb.CreatePosition(new Vector3(1f, 1f, 1f));
mb.CreatePosition(new Vector3(2f, 2f, 2f));
mb.SetMaterial(material1);
mb.AddTriangleVertex(2);
mb.AddTriangleVertex(1);
mb.AddTriangleVertex(0);
mb.AddTriangleVertex(5);
mb.AddTriangleVertex(4);
mb.AddTriangleVertex(3);
mb.SetMaterial(material2);
mb.AddTriangleVertex(5);
mb.AddTriangleVertex(4);
mb.AddTriangleVertex(3);
var mesh = mb.FinishMesh();
Assert.AreEqual(6, mesh.Positions.Count);
MeshHelper.MergeDuplicatePositions(mesh, 1f);
Assert.AreEqual(3, mesh.Positions.Count);
var geom = mesh.Geometry[0];
Assert.AreEqual(6, geom.Vertices.Positions.Count);
Assert.AreEqual(6, geom.Vertices.PositionIndices.Count);
Assert.AreEqual(2, geom.Vertices.PositionIndices[0]);
Assert.AreEqual(1, geom.Vertices.PositionIndices[1]);
Assert.AreEqual(0, geom.Vertices.PositionIndices[2]);
Assert.AreEqual(2, geom.Vertices.PositionIndices[0]);
Assert.AreEqual(1, geom.Vertices.PositionIndices[1]);
Assert.AreEqual(0, geom.Vertices.PositionIndices[2]);
geom = mesh.Geometry[1];
Assert.AreEqual(3, geom.Vertices.Positions.Count);
Assert.AreEqual(3, geom.Vertices.PositionIndices.Count);
Assert.AreEqual(2, geom.Vertices.PositionIndices[0]);
Assert.AreEqual(1, geom.Vertices.PositionIndices[1]);
Assert.AreEqual(0, geom.Vertices.PositionIndices[2]);
}
}
}