/// <summary>
/// Fills in a set of spherically mapped texture coordinates to the passed in mesh
/// </summary>
private static void SetSphericalTextureCoordinates(Mesh mesh)
{
BoundingSphere boundingSphere = BufferHelper.ComputeBoundingSphere(mesh);
var vertexes = BufferHelper.ReadVertexBuffer <PositionNormalTextured>(mesh);
for (int i = 0; i < vertexes.Length; i++)
{
Vector3 vertexRay = Vector3.Normalize(vertexes[i].Position - boundingSphere.Center);
double phi = Math.Acos(vertexRay.Z);
vertexes[i].Tu = CalculateTu(vertexRay, phi);
vertexes[i].Tv = (float)(phi / Math.PI);
}
BufferHelper.WriteVertexBuffer(mesh, vertexes);
}
/// <summary>
/// Sets box texture coordinates where a 3x2 grid of face textures is split one per face
/// </summary>
private static void SetBoxTextureCoordinates(Mesh mesh)
{
#region Sanity checks
// Check the mesh looks like a box and has texture coordinates
if (mesh.VertexCount != 24 || mesh.FaceCount != 12)
{
throw new ArgumentException("The mesh does not look like a box.", nameof(mesh));
}
if (mesh.VertexFormat != PositionNormalTextured.Format)
{
throw new ArgumentException("The mesh doesn't have the correct format.", nameof(mesh));
}
#endregion
// Copy the vertex buffer content to an array
var vertexes = BufferHelper.ReadVertexBuffer <PositionNormalTextured>(mesh);
#region Set texture coordinates
// Bottom
vertexes[13].Tu = 0f;
vertexes[13].Tv = 0f;
vertexes[14].Tu = 1f / 3f;
vertexes[14].Tv = 0f;
vertexes[15].Tu = 1f / 3f;
vertexes[15].Tv = 0.5f;
vertexes[12].Tu = 0f;
vertexes[12].Tv = 0.5f;
// Top
vertexes[5].Tu = 1f / 3f;
vertexes[5].Tv = 0f;
vertexes[6].Tu = 2f / 3f;
vertexes[6].Tv = 0f;
vertexes[7].Tu = 2f / 3f;
vertexes[7].Tv = 0.5f;
vertexes[4].Tu = 1f / 3f;
vertexes[4].Tv = 0.5f;
// Back
vertexes[18].Tu = 2f / 3f;
vertexes[18].Tv = 0f;
vertexes[19].Tu = 1f;
vertexes[19].Tv = 0f;
vertexes[16].Tu = 1f;
vertexes[16].Tv = 0.5f;
vertexes[17].Tu = 2f / 3f;
vertexes[17].Tv = 0.5f;
// Left
vertexes[2].Tu = 0f;
vertexes[2].Tv = 0.5f;
vertexes[3].Tu = 1f / 3f;
vertexes[3].Tv = 0.5f;
vertexes[0].Tu = 1f / 3f;
vertexes[0].Tv = 1f;
vertexes[1].Tu = 0f;
vertexes[1].Tv = 1f;
// Front
vertexes[21].Tu = 1f / 3f;
vertexes[21].Tv = 0.5f;
vertexes[22].Tu = 2f / 3f;
vertexes[22].Tv = 0.5f;
vertexes[23].Tu = 2f / 3f;
vertexes[23].Tv = 1f;
vertexes[20].Tu = 1f / 3f;
vertexes[20].Tv = 1f;
// Right
vertexes[8].Tu = 2f / 3f;
vertexes[8].Tv = 0.5f;
vertexes[9].Tu = 1f;
vertexes[9].Tv = 0.5f;
vertexes[10].Tu = 1f;
vertexes[10].Tv = 1f;
vertexes[11].Tu = 2f / 3f;
vertexes[11].Tv = 1f;
#endregion
// Copy the array back into the vertex buffer
BufferHelper.WriteVertexBuffer(mesh, vertexes);
}
/// <summary>
/// Creates a model of a textured round disc with a hole in the middle.
/// </summary>
/// <param name="device">The <see cref="Device"/> to create the mesh in.</param>
/// <param name="radiusInner">The radius of the inner circle of the ring.</param>
/// <param name="radiusOuter">The radius of the outer circle of the ring.</param>
/// <param name="height">The height of the ring.</param>
/// <param name="segments">The number of segments the ring shall consist of.</param>
public static Mesh Disc(Device device, float radiusInner, float radiusOuter, float height, int segments)
{
#region Sanity checks
if (device == null)
{
throw new ArgumentNullException(nameof(device));
}
#endregion
const float tuInner = 0, tuOuter = 1;
Log.Info("Generate predefined model: Disc");
var posInner = new Vector3(radiusInner, 0, 0);
var posOuter = new Vector3(radiusOuter, 0, 0);
#region Generate vertexes
int vertCount = 0;
var step = (float)(Math.PI * 2 / segments);
var vertexes = new PositionTextured[segments * 4];
for (int i = 0; i < segments; i++)
{
vertexes[vertCount++] = new PositionTextured(posInner.X, posInner.Y - height / 2, posInner.Z, tuInner, 0);
vertexes[vertCount++] = new PositionTextured(posInner.X, posInner.Y + height / 2, posInner.Z, tuInner, 0);
vertexes[vertCount++] = new PositionTextured(posOuter.X, posOuter.Y - height / 2, posOuter.Z, tuOuter, 0);
vertexes[vertCount++] = new PositionTextured(posOuter.X, posOuter.Y + height / 2, posOuter.Z, tuOuter, 0);
// Increment rotation
posInner = Vector3.TransformCoordinate(posInner, Matrix.RotationY(step));
posOuter = Vector3.TransformCoordinate(posOuter, Matrix.RotationY(step));
}
#endregion
#region Generate indexes
int indexCount = 0;
var indexes = new short[segments * 24];
for (int i = 0; i < segments; i++)
{
short innerBottom1 = (short)(i * 4), innerTop1 = (short)(i * 4 + 1);
short outerBottom1 = (short)(i * 4 + 2), outerTop1 = (short)(i * 4 + 3);
short innerBottom2 = (short)(i * 4 + 4), innerTop2 = (short)(i * 4 + 5);
short outerBottom2 = (short)(i * 4 + 6), outerTop2 = (short)(i * 4 + 7);
if (innerBottom2 >= vertexes.Length)
{
innerBottom2 -= (short)vertexes.Length;
}
if (innerTop2 >= vertexes.Length)
{
innerTop2 -= (short)vertexes.Length;
}
if (outerBottom2 >= vertexes.Length)
{
outerBottom2 -= (short)vertexes.Length;
}
if (outerTop2 >= vertexes.Length)
{
outerTop2 -= (short)vertexes.Length;
}
// Bottom 2 triangles
indexes[indexCount++] = innerBottom1;
indexes[indexCount++] = innerBottom2;
indexes[indexCount++] = outerBottom2;
indexes[indexCount++] = innerBottom1;
indexes[indexCount++] = outerBottom2;
indexes[indexCount++] = outerBottom1;
// Top 2 triangles
indexes[indexCount++] = innerTop1;
indexes[indexCount++] = outerTop2;
indexes[indexCount++] = innerTop2;
indexes[indexCount++] = innerTop1;
indexes[indexCount++] = outerTop1;
indexes[indexCount++] = outerTop2;
// Inner 2 triangles
indexes[indexCount++] = innerTop1;
indexes[indexCount++] = innerBottom2;
indexes[indexCount++] = innerBottom1;
indexes[indexCount++] = innerTop1;
indexes[indexCount++] = innerTop2;
indexes[indexCount++] = innerBottom2;
// Outer 2 triangles
indexes[indexCount++] = outerBottom1;
indexes[indexCount++] = outerBottom2;
indexes[indexCount++] = outerTop1;
indexes[indexCount++] = outerBottom2;
indexes[indexCount++] = outerTop2;
indexes[indexCount++] = outerTop1;
}
#endregion
var mesh = new Mesh(device, indexes.Length / 3, vertexes.Length, MeshFlags.Managed, PositionTextured.Format);
BufferHelper.WriteVertexBuffer(mesh, vertexes);
BufferHelper.WriteIndexBuffer(mesh, indexes);
MeshHelper.GenerateNormalsAndTangents(device, ref mesh, false);
return(mesh);
}
/// <summary>
/// Creates a new <see cref="Mesh"/> representing a textured sphere with spherical mapping.
/// </summary>
/// <param name="device">The <see cref="Device"/> to create the mesh in</param>
/// <param name="radius">The radius of the sphere.</param>
/// <param name="slices">The number of vertical slices to divide the sphere into.</param>
/// <param name="stacks">The number of horizontal stacks to divide the sphere into.</param>
/// <remarks>The sphere is formed like the one created by <see cref="Mesh.CreateSphere"/>.</remarks>
public static Mesh Sphere(Device device, float radius, int slices, int stacks)
{
#region Sanity checks
if (device == null)
{
throw new ArgumentNullException(nameof(device));
}
if (slices <= 0)
{
throw new ArgumentOutOfRangeException(nameof(slices));
}
if (stacks <= 0)
{
throw new ArgumentOutOfRangeException(nameof(stacks));
}
#endregion
int numVertexes = (slices + 1) * (stacks + 1);
int numFaces = slices * stacks * 2;
int indexCount = numFaces * 3;
var mesh = new Mesh(device, numFaces, numVertexes, MeshFlags.Managed, PositionNormalTextured.Format);
#region Build sphere vertexes
var vertexes = new PositionNormalTextured[mesh.VertexCount];
int vertIndex = 0;
for (int slice = 0; slice <= slices; slice++)
{
float alphaY = (float)slice / slices * (float)Math.PI * 2.0f; // Angle around Y-axis
for (int stack = 0; stack <= stacks; stack++)
{
if (slice == slices)
{
vertexes[vertIndex] = vertexes[stack];
}
else
{
var pnt = new PositionNormalTextured();
float alphaZ = ((stack - stacks * 0.5f) / stacks) * (float)Math.PI * 1.0f; // Angle around Z-axis
pnt.X = (float)(Math.Cos(alphaY) * radius) * (float)Math.Cos(alphaZ);
pnt.Z = (float)(Math.Sin(alphaY) * radius) * (float)Math.Cos(alphaZ);
pnt.Y = (float)(Math.Sin(alphaZ) * radius);
pnt.Nx = pnt.X / radius;
pnt.Ny = pnt.Y / radius;
pnt.Nz = pnt.Z / radius;
pnt.Tv = 0.5f - (float)(Math.Asin(pnt.Y / radius) / Math.PI);
vertexes.SetValue(pnt, vertIndex);
}
vertexes[vertIndex++].Tu = (float)slice / slices;
}
}
#endregion
BufferHelper.WriteVertexBuffer(mesh, vertexes);
#region Build index buffer
var indexes = new short[indexCount];
int i = 0;
for (short x = 0; x < slices; x++)
{
var leftVertex = (short)((stacks + 1) * x);
var rightVertex = (short)(leftVertex + stacks + 1);
for (int y = 0; y < stacks; y++)
{
indexes[i++] = rightVertex;
indexes[i++] = leftVertex;
indexes[i++] = (short)(leftVertex + 1);
indexes[i++] = rightVertex;
indexes[i++] = (short)(leftVertex + 1);
indexes[i++] = (short)(rightVertex + 1);
leftVertex++;
rightVertex++;
}
}
#endregion
BufferHelper.WriteIndexBuffer(mesh, indexes);
return(mesh);
}
/// <summary>
/// Generate normals and tangents if not present and convert into TangentVertex format for shaders.
/// </summary>
/// <param name="device">The <see cref="Device"/> containing the mesh</param>
/// <param name="mesh">The mesh to be manipulated</param>
/// <param name="weldVertexes">Weld vertexes before generating tangents.
/// Useful for organic objects, stones, trees, etc. (anything with a lot of round surfaces).
/// If a lot of single faces are not connected on the texture (e.g. rockets, buildings, etc.) do not use.</param>
public static void GenerateNormalsAndTangents(Device device, ref Mesh mesh, bool weldVertexes)
{
#region Sanity checks
if (device == null)
{
throw new ArgumentNullException(nameof(device));
}
if (mesh == null)
{
throw new ArgumentNullException(nameof(mesh));
}
#endregion
bool hadNormals, hadTangents;
if (!ExpandDeclaration(device, ref mesh, out hadNormals, out hadTangents))
{
return;
}
var decl = mesh.GetDeclaration();
#region Check existing info
bool gotMilkErmTexCoords = false;
bool gotValidNormals = true;
bool gotValidTangents = true;
var vertexes = BufferHelper.ReadVertexBuffer <PositionNormalBinormalTangentTextured>(mesh);
// Check all vertexes
for (int num = 0; num < vertexes.Length; num++)
{
// We need at least 1 texture coordinate different from (0, 0)
if (vertexes[num].Tu != 0.0f ||
vertexes[num].Tv != 0.0f)
{
gotMilkErmTexCoords = true;
}
// All normals and tangents must be valid, otherwise generate them below
if (vertexes[num].Normal == default(Vector3))
{
gotValidNormals = false;
}
if (vertexes[num].Tangent == default(Vector3))
{
gotValidTangents = false;
}
// If we found valid texture coordinates and no normals or tangents,
// there isn't anything left to check here
if (gotMilkErmTexCoords && !gotValidNormals && !gotValidTangents)
{
break;
}
}
// If declaration had normals, but we found no valid normals,
// set hadNormals to false and generate valid normals (see below)
if (!gotValidNormals)
{
hadNormals = false;
}
// Same check for tangents
if (!gotValidTangents)
{
hadTangents = false;
}
// Generate dummy texture coordinates
if (!gotMilkErmTexCoords)
{
for (int num = 0; num < vertexes.Length; num++)
{
vertexes[num].Tu = -0.75f + vertexes[num].Position.X / 2.0f;
vertexes[num].Tv = +0.75f - vertexes[num].Position.Y / 2.0f;
}
}
BufferHelper.WriteVertexBuffer(mesh, vertexes);
#endregion
if (!hadNormals)
{
using (new TimedLogEvent("Computed normals"))
mesh.ComputeNormals();
}
if (weldVertexes)
{
// Reduce amount of vertexes
var weldEpsilons = new WeldEpsilons {
Position = 0.0001f, Normal = 0.0001f
};
mesh.WeldVertices(WeldFlags.WeldPartialMatches, weldEpsilons);
if (!hadTangents)
{
#region Compute tangents
using (new TimedLogEvent("Computed tangents"))
{
// If the vertexes for a smoothend point exist several times the
// DirectX ComputeTangent method is not able to treat them all the
// same way.
// To circumvent this, we collapse all vertexes in a cloned mesh
// even if the texture coordinates don't fit. Then we copy the
// generated tangents back to the original mesh vertexes (duplicating
// the tangents for vertexes at the same point with the same normals
// if required). This happens usually with models exported from 3DSMax.
// Clone mesh just for tangent generation
Mesh dummyTangentGenerationMesh = mesh.Clone(device, mesh.CreationOptions, decl);
// Reuse weldEpsilons, just change the TextureCoordinates, which we don't care about anymore
weldEpsilons.TextureCoordinate1 = 1;
weldEpsilons.TextureCoordinate2 = 1;
weldEpsilons.TextureCoordinate3 = 1;
weldEpsilons.TextureCoordinate4 = 1;
weldEpsilons.TextureCoordinate5 = 1;
weldEpsilons.TextureCoordinate6 = 1;
weldEpsilons.TextureCoordinate7 = 1;
weldEpsilons.TextureCoordinate8 = 1;
// Rest of the weldEpsilons values can stay 0, we don't use them
dummyTangentGenerationMesh.WeldVertices(WeldFlags.WeldPartialMatches, weldEpsilons);
// Compute tangents
if (!CompareDecl(PositionNormalMultiTextured.GetVertexElements(), decl))
{
dummyTangentGenerationMesh.ComputeTangent(0, 0, 0, false);
}
var tangentVertexes = BufferHelper.ReadVertexBuffer <PositionNormalBinormalTangentTextured>(dummyTangentGenerationMesh);
dummyTangentGenerationMesh.Dispose();
// Copy generated tangents back
vertexes = BufferHelper.ReadVertexBuffer <PositionNormalBinormalTangentTextured>(mesh);
for (int num = 0; num < vertexes.Length; num++)
{
// Search for tangent vertex with the exact same position and normal.
for (int tangentVertexNum = 0; tangentVertexNum < tangentVertexes.Length; tangentVertexNum++)
{
if (vertexes[num].Position == tangentVertexes[tangentVertexNum].Position && vertexes[num].Normal == tangentVertexes[tangentVertexNum].Normal)
{
// Copy the tangent over
vertexes[num].Tangent = tangentVertexes[tangentVertexNum].Tangent;
// No more checks required, proceed with next vertex
break;
}
}
}
BufferHelper.WriteVertexBuffer(mesh, vertexes);
}
#endregion
}
}
else
{
if (!hadTangents && CompareDecl(PositionNormalMultiTextured.GetVertexElements(), decl))
{
using (new TimedLogEvent("Computed tangents"))
mesh.ComputeTangent(0, 0, D3DX.Default, false);
}
}
Optimize(mesh);
}
/// <summary>
/// Generate normals if not present and convert into TangentVertex format for shaders.
/// Tangent data is left empty
/// </summary>
/// <param name="device">The <see cref="Device"/> containing the mesh</param>
/// <param name="mesh">The mesh to be manipulated</param>
public static void GenerateNormals(Device device, ref Mesh mesh)
{
#region Sanity checks
if (device == null)
{
throw new ArgumentNullException(nameof(device));
}
if (mesh == null)
{
throw new ArgumentNullException(nameof(mesh));
}
#endregion
bool hadNormals, hadTangents;
if (!ExpandDeclaration(device, ref mesh, out hadNormals, out hadTangents))
{
return;
}
#region Check existing info
bool gotMilkErmTexCoords = false;
bool gotValidNormals = true;
var vertexes = BufferHelper.ReadVertexBuffer <PositionNormalBinormalTangentTextured>(mesh);
// Check all vertexes
for (int num = 0; num < vertexes.Length; num++)
{
// We need at least 1 texture coordinate different from (0, 0)
if (vertexes[num].Tu != 0.0f ||
vertexes[num].Tv != 0.0f)
{
gotMilkErmTexCoords = true;
}
// All normals and tangents must be valid, otherwise generate them below
if (vertexes[num].Normal == default(Vector3))
{
gotValidNormals = false;
}
}
// If declaration had normals, but we found no valid normals,
// set hadNormals to false and generate valid normals (see below)
if (!gotValidNormals)
{
hadNormals = false;
}
// Generate dummy texture coordinates
if (!gotMilkErmTexCoords)
{
for (int num = 0; num < vertexes.Length; num++)
{
vertexes[num].Tu = -0.75f + vertexes[num].Position.X / 2.0f;
vertexes[num].Tv = +0.75f - vertexes[num].Position.Y / 2.0f;
}
}
BufferHelper.WriteVertexBuffer(mesh, vertexes);
#endregion
// Assume meshes with propper normal data also have been optimized for rendering
if (!hadNormals)
{
using (new TimedLogEvent("Computed normals"))
mesh.ComputeNormals();
Optimize(mesh);
}
}