public SimpleMesh GenerateSimpleMesh(Primitive prim, DetailLevel lod)
{
Path path = GeneratePath();
Profile profile = GenerateProfile();
MeshmerizerMesh meshmerizer = new MeshmerizerMesh();
meshmerizer = GenerateMeshmerizerMesh(prim);
// Create the vertex array
List <Vertex> vertices = new List <Vertex>(meshmerizer.primMesh.coords.Count);
for (int i = 0; i < meshmerizer.primMesh.coords.Count; i++)
{
Coord c = meshmerizer.primMesh.coords[i];
Vertex vertex = new Vertex();
vertex.Position = new Vector3(c.X, c.Y, c.Z);
vertices.Add(vertex);
}
// Create the index array
List <ushort> indices = new List <ushort>(meshmerizer.primMesh.faces.Count * 3);
for (int i = 0; i < meshmerizer.primMesh.faces.Count; i++)
{
MeshmerizerFace f = meshmerizer.primMesh.faces[i];
indices.Add((ushort)f.v1);
indices.Add((ushort)f.v2);
indices.Add((ushort)f.v3);
}
SimpleMesh mesh = new SimpleMesh();
mesh.Prim = prim;
mesh.Path = path;
mesh.Profile = profile;
mesh.Vertices = vertices;
mesh.Indices = indices;
return(mesh);
}
private List <Face> GenerateFaces(Primitive prim)
{
MeshmerizerMesh meshmerizer = new MeshmerizerMesh();
meshmerizer = GenerateMeshmerizerMesh(prim);
// Create the vertex array
List <Vertex> vertices = new List <Vertex>(meshmerizer.primMesh.coords.Count);
for (int i = 0; i < meshmerizer.primMesh.coords.Count; i++)
{
Coord c = meshmerizer.primMesh.coords[i];
Vertex vertex = new Vertex();
vertex.Position = new Vector3(c.X, c.Y, c.Z);
vertices.Add(vertex);
}
// Create the index array
List <ushort> indices = new List <ushort>(meshmerizer.primMesh.faces.Count * 3);
for (int i = 0; i < meshmerizer.primMesh.faces.Count; i++)
{
MeshmerizerFace f = meshmerizer.primMesh.faces[i];
indices.Add((ushort)f.v1);
indices.Add((ushort)f.v2);
indices.Add((ushort)f.v3);
}
Face face = new Face();
face.Edge = new List <int>();
face.TextureFace = prim.Textures.DefaultTexture;
face.Vertices = vertices;
face.Indices = indices;
List <Face> faces = new List <Face>(1);
faces.Add(face);
return(faces);
}
public SimpleMesh GenerateSimpleMesh(Primitive prim, DetailLevel lod)
{
Path path = GeneratePath();
Profile profile = GenerateProfile();
MeshmerizerMesh meshmerizer = new MeshmerizerMesh();
meshmerizer = GenerateMeshmerizerMesh(prim);
// Create the vertex array
List<Vertex> vertices = new List<Vertex>(meshmerizer.primMesh.coords.Count);
for (int i = 0; i < meshmerizer.primMesh.coords.Count; i++)
{
Coord c = meshmerizer.primMesh.coords[i];
Vertex vertex = new Vertex();
vertex.Position = new Vector3(c.X, c.Y, c.Z);
vertices.Add(vertex);
}
// Create the index array
List<ushort> indices = new List<ushort>(meshmerizer.primMesh.faces.Count * 3);
for (int i = 0; i < meshmerizer.primMesh.faces.Count; i++)
{
MeshmerizerFace f = meshmerizer.primMesh.faces[i];
indices.Add((ushort)f.v1);
indices.Add((ushort)f.v2);
indices.Add((ushort)f.v3);
}
SimpleMesh mesh = new SimpleMesh();
mesh.Prim = prim;
mesh.Path = path;
mesh.Profile = profile;
mesh.Vertices = vertices;
mesh.Indices = indices;
return mesh;
}
/// <summary>
/// Creates an extrusion of a profile along a linear path. Used to create prim types box, cylinder, and prism.
/// </summary>
/// <param name="m"></param>
/// <returns>A mesh of the extruded shape</returns>
public MeshmerizerMesh ExtrudeLinearPath(MeshmerizerMesh m)
{
MeshmerizerMesh result = new MeshmerizerMesh();
MeshmerizerMesh newLayer;
MeshmerizerMesh lastLayer = null;
int step = 0;
int steps = 1;
float twistTotal = twistTop - twistBot;
// if the profile has a lot of twist, add more layers otherwise the layers may overlap
// and the resulting mesh may be quite inaccurate. This method is arbitrary and may not
// accurately match the viewer
float twistTotalAbs = System.Math.Abs(twistTotal);
if (twistTotalAbs > 0.01)
steps += (int)(twistTotalAbs * 3.66f); // dahlia's magic number ;)
double percentOfPathMultiplier = 1.0 / steps;
float start = -0.5f;
float stepSize = 1.0f / (float)steps;
float xProfileScale = 1.0f;
float yProfileScale = 1.0f;
float xOffset = 0.0f;
float yOffset = 0.0f;
float zOffset = start;
float xOffsetStepIncrement = pushX / steps;
float yOffsetStepIncrement = pushY / steps;
//float percentOfPath = 0.0f;
float percentOfPath = (float)pathBegin * 2.0e-5f;
zOffset += percentOfPath;
bool done = false;
do // loop through the length of the path and add the layers
{
newLayer = m.Clone();
if (taperBotFactorX < 1.0f)
xProfileScale = 1.0f - (1.0f - percentOfPath) * (1.0f - taperBotFactorX);
else if (taperTopFactorX < 1.0f)
xProfileScale = 1.0f - percentOfPath * (1.0f - taperTopFactorX);
else xProfileScale = 1.0f;
if (taperBotFactorY < 1.0f)
yProfileScale = 1.0f - (1.0f - percentOfPath) * (1.0f - taperBotFactorY);
else if (taperTopFactorY < 1.0f)
yProfileScale = 1.0f - percentOfPath * (1.0f - taperTopFactorY);
else yProfileScale = 1.0f;
MeshmerizerVertex vTemp = new MeshmerizerVertex(0.0f, 0.0f, 0.0f);
// apply the taper to the profile before any rotations
if (xProfileScale != 1.0f || yProfileScale != 1.0f)
{
foreach (MeshmerizerVertex v in newLayer.vertices)
{
if (v != null)
{
v.X *= xProfileScale;
v.Y *= yProfileScale;
}
}
}
float twist = twistBot + (twistTotal * (float)percentOfPath);
// apply twist rotation to the profile layer and position the layer in the prim
Quaternion profileRot = Quaternion.CreateFromAxisAngle(new Vector3(0.0f, 0.0f, 1.0f), twist);
foreach (MeshmerizerVertex v in newLayer.vertices)
{
if (v != null)
{
vTemp = v * profileRot;
v.X = vTemp.X + xOffset;
v.Y = vTemp.Y + yOffset;
v.Z = vTemp.Z + zOffset;
}
}
if (step == 0) // the first layer, invert normals
{
foreach (Triangle t in newLayer.triangles)
{
t.invertNormal();
}
}
result.Append(newLayer);
int iLastNull = 0;
if (lastLayer != null)
{
int i, count = newLayer.vertices.Count;
for (i = 0; i < count; i++)
{
int iNext = (i + 1);
if (lastLayer.vertices[i] == null) // cant make a simplex here
{
iLastNull = i + 1;
}
else
{
if (i == count - 1) // End of list
iNext = iLastNull;
if (lastLayer.vertices[iNext] == null) // Null means wrap to begin of last segment
iNext = iLastNull;
result.Add(new Triangle(newLayer.vertices[i], lastLayer.vertices[i], newLayer.vertices[iNext]));
result.Add(new Triangle(newLayer.vertices[iNext], lastLayer.vertices[i], lastLayer.vertices[iNext]));
}
}
}
lastLayer = newLayer;
// calc the step for the next interation of the loop
if (step < steps)
{
step++;
percentOfPath += (float)percentOfPathMultiplier;
xOffset += xOffsetStepIncrement;
yOffset += yOffsetStepIncrement;
zOffset += stepSize;
if (percentOfPath > 1.0f - (float)pathEnd * 2.0e-5f)
done = true;
}
else done = true;
} while (!done); // loop until all the layers in the path are completed
return result;
}
/// <summary>
/// Extrudes a shape around a circular path. Used to create prim types torus, ring, and tube.
/// </summary>
/// <param name="m"></param>
/// <returns>a mesh of the extruded shape</returns>
public MeshmerizerMesh ExtrudeCircularPath(MeshmerizerMesh m)
{
MeshmerizerMesh result = new MeshmerizerMesh();
MeshmerizerMesh newLayer;
MeshmerizerMesh lastLayer = null;
int step;
int steps = 24;
float twistTotal = twistTop - twistBot;
// if the profile has a lot of twist, add more layers otherwise the layers may overlap
// and the resulting mesh may be quite inaccurate. This method is arbitrary and doesn't
// accurately match the viewer
if (System.Math.Abs(twistTotal) > (float)System.Math.PI * 1.5f) steps *= 2;
if (System.Math.Abs(twistTotal) > (float)System.Math.PI * 3.0f) steps *= 2;
// double percentOfPathMultiplier = 1.0 / steps;
// double angleStepMultiplier = System.Math.PI * 2.0 / steps;
float yPathScale = pathScaleY * 0.5f;
float pathLength = pathCutEnd - pathCutBegin;
float totalSkew = skew * 2.0f * pathLength;
float skewStart = (-skew) + pathCutBegin * 2.0f * skew;
// It's not quite clear what pushY (Y top shear) does, but subtracting it from the start and end
// angles appears to approximate it's effects on path cut. Likewise, adding it to the angle used
// to calculate the sine for generating the path radius appears to approximate it's effects there
// too, but there are some subtle differences in the radius which are noticeable as the prim size
// increases and it may affect megaprims quite a bit. The effect of the Y top shear parameter on
// the meshes generated with this technique appear nearly identical in shape to the same prims when
// displayed by the viewer.
float startAngle = (float)(System.Math.PI * 2.0 * pathCutBegin * revolutions) - pushY * 0.9f;
float endAngle = (float)(System.Math.PI * 2.0 * pathCutEnd * revolutions) - pushY * 0.9f;
float stepSize = (float)0.2617993878; // 2*PI / 24 segments per revolution
step = (int)(startAngle / stepSize);
float angle = startAngle;
float xProfileScale = 1.0f;
float yProfileScale = 1.0f;
bool done = false;
do // loop through the length of the path and add the layers
{
newLayer = m.Clone();
float percentOfPath = (angle - startAngle) / (endAngle - startAngle); // endAngle should always be larger than startAngle
if (pathTaperX > 0.001f) // can't really compare to 0.0f as the value passed is never exactly zero
xProfileScale = 1.0f - percentOfPath * pathTaperX;
else if (pathTaperX < -0.001f)
xProfileScale = 1.0f + (1.0f - percentOfPath) * pathTaperX;
else xProfileScale = 1.0f;
if (pathTaperY > 0.001f)
yProfileScale = 1.0f - percentOfPath * pathTaperY;
else if (pathTaperY < -0.001f)
yProfileScale = 1.0f + (1.0f - percentOfPath) * pathTaperY;
else yProfileScale = 1.0f;
MeshmerizerVertex vTemp = new MeshmerizerVertex(0.0f, 0.0f, 0.0f);
// apply the taper to the profile before any rotations
if (xProfileScale != 1.0f || yProfileScale != 1.0f)
{
foreach (MeshmerizerVertex v in newLayer.vertices)
{
if (v != null)
{
v.X *= xProfileScale;
v.Y *= yProfileScale;
}
}
}
float radiusScale;
if (radius > 0.001f)
radiusScale = 1.0f - radius * percentOfPath;
else if (radius < 0.001f)
radiusScale = 1.0f + radius * (1.0f - percentOfPath);
else
radiusScale = 1.0f;
float twist = twistBot + (twistTotal * (float)percentOfPath);
float xOffset;
float yOffset;
float zOffset;
xOffset = 0.5f * (skewStart + totalSkew * (float)percentOfPath);
xOffset += (float)System.Math.Sin(angle) * pushX * 0.45f;
yOffset = (float)(System.Math.Cos(angle) * (0.5f - yPathScale)) * radiusScale;
zOffset = (float)(System.Math.Sin(angle + pushY * 0.9f) * (0.5f - yPathScale)) * radiusScale;
// next apply twist rotation to the profile layer
if (twistTotal != 0.0f || twistBot != 0.0f)
{
Quaternion profileRot = new Quaternion(new Vector3(0.0f, 0.0f, 1.0f), twist);
foreach (MeshmerizerVertex v in newLayer.vertices)
{
if (v != null)
{
vTemp = v * profileRot;
v.X = vTemp.X;
v.Y = vTemp.Y;
v.Z = vTemp.Z;
}
}
}
// now orient the rotation of the profile layer relative to it's position on the path
// adding pushY to the angle used to generate the quat appears to approximate the viewer
Quaternion layerRot = Quaternion.CreateFromAxisAngle(new Vector3(1.0f, 0.0f, 0.0f), (float)angle + pushY * 0.9f);
foreach (MeshmerizerVertex v in newLayer.vertices)
{
if (v != null)
{
vTemp = v * layerRot;
v.X = vTemp.X + xOffset;
v.Y = vTemp.Y + yOffset;
v.Z = vTemp.Z + zOffset;
}
}
if (angle == startAngle) // the first layer, invert normals
{
foreach (Triangle t in newLayer.triangles)
{
t.invertNormal();
}
}
result.Append(newLayer);
int iLastNull = 0;
if (lastLayer != null)
{
int i, count = newLayer.vertices.Count;
for (i = 0; i < count; i++)
{
int iNext = (i + 1);
if (lastLayer.vertices[i] == null) // cant make a simplex here
{
iLastNull = i + 1;
}
else
{
if (i == count - 1) // End of list
iNext = iLastNull;
if (lastLayer.vertices[iNext] == null) // Null means wrap to begin of last segment
iNext = iLastNull;
result.Add(new Triangle(newLayer.vertices[i], lastLayer.vertices[i], newLayer.vertices[iNext]));
result.Add(new Triangle(newLayer.vertices[iNext], lastLayer.vertices[i], lastLayer.vertices[iNext]));
}
}
}
lastLayer = newLayer;
// calc the angle for the next interation of the loop
if (angle >= endAngle)
{
done = true;
}
else
{
angle = stepSize * ++step;
if (angle > endAngle)
angle = endAngle;
}
} while (!done); // loop until all the layers in the path are completed
return result;
}
private List<Face> GenerateFaces(Primitive prim)
{
MeshmerizerMesh meshmerizer = new MeshmerizerMesh();
meshmerizer = GenerateMeshmerizerMesh(prim);
// Create the vertex array
List<Vertex> vertices = new List<Vertex>(meshmerizer.primMesh.coords.Count);
for (int i = 0; i < meshmerizer.primMesh.coords.Count; i++)
{
Coord c = meshmerizer.primMesh.coords[i];
Vertex vertex = new Vertex();
vertex.Position = new Vector3(c.X, c.Y, c.Z);
vertices.Add(vertex);
}
// Create the index array
List<ushort> indices = new List<ushort>(meshmerizer.primMesh.faces.Count * 3);
for (int i = 0; i < meshmerizer.primMesh.faces.Count; i++)
{
MeshmerizerFace f = meshmerizer.primMesh.faces[i];
indices.Add((ushort)f.v1);
indices.Add((ushort)f.v2);
indices.Add((ushort)f.v3);
}
Face face = new Face();
face.Edge = new List<int>();
face.TextureFace = prim.Textures.DefaultTexture;
face.Vertices = vertices;
face.Indices = indices;
List<Face> faces = new List<Face>(1);
faces.Add(face);
return faces;
}
private MeshmerizerMesh GenerateMeshmerizerMesh(Primitive prim)
{
PrimitiveBaseShape primShape = new PrimitiveBaseShape(prim);
MeshmerizerMesh mesh = new MeshmerizerMesh();
float pathShearX = primShape.PathShearX < 128 ? (float)primShape.PathShearX * 0.01f : (float)(primShape.PathShearX - 256) * 0.01f;
float pathShearY = primShape.PathShearY < 128 ? (float)primShape.PathShearY * 0.01f : (float)(primShape.PathShearY - 256) * 0.01f;
float pathBegin = (float)primShape.PathBegin * 2.0e-5f;
float pathEnd = 1.0f - (float)primShape.PathEnd * 2.0e-5f;
float pathScaleX = (float)(primShape.PathScaleX - 100) * 0.01f;
float pathScaleY = (float)(primShape.PathScaleY - 100) * 0.01f;
float profileBegin = (float)primShape.ProfileBegin * 2.0e-5f;
float profileEnd = 1.0f - (float)primShape.ProfileEnd * 2.0e-5f;
float profileHollow = (float)primShape.ProfileHollow * 2.0e-5f;
int sides = 4;
if ((primShape.ProfileCurve & 0x07) == (byte)ProfileShape.EquilateralTriangle)
sides = 3;
else if ((primShape.ProfileCurve & 0x07) == (byte)ProfileShape.Circle)
sides = 24;
else if ((primShape.ProfileCurve & 0x07) == (byte)ProfileShape.HalfCircle)
{
// half circle, prim is a sphere
sides = 24;
profileBegin = 0.5f * profileBegin + 0.5f;
profileEnd = 0.5f * profileEnd + 0.5f;
}
int hollowSides = sides;
if (primShape.HollowShape == HollowShape.Circle)
hollowSides = 24;
else if (primShape.HollowShape == HollowShape.Square)
hollowSides = 4;
else if (primShape.HollowShape == HollowShape.Triangle)
hollowSides = 3;
PrimMesh primMesh = new PrimMesh(sides, profileBegin, profileEnd, profileHollow, hollowSides);
primMesh.topShearX = pathShearX;
primMesh.topShearY = pathShearY;
primMesh.pathCutBegin = pathBegin;
primMesh.pathCutEnd = pathEnd;
if (primShape.PathCurve == (byte)Extrusion.Straight)
{
primMesh.twistBegin = primShape.PathTwistBegin * 18 / 10;
primMesh.twistEnd = primShape.PathTwist * 18 / 10;
primMesh.taperX = pathScaleX;
primMesh.taperY = pathScaleY;
try
{
primMesh.ExtrudeLinear();
}
catch (Exception)
{
return null;
}
}
else
{
primMesh.holeSizeX = (200 - primShape.PathScaleX) * 0.01f;
primMesh.holeSizeY = (200 - primShape.PathScaleY) * 0.01f;
primMesh.radius = 0.01f * primShape.PathRadiusOffset;
primMesh.revolutions = 1.0f + 0.015f * primShape.PathRevolutions;
primMesh.skew = 0.01f * primShape.PathSkew;
primMesh.twistBegin = primShape.PathTwistBegin * 36 / 10;
primMesh.twistEnd = primShape.PathTwist * 36 / 10;
primMesh.taperX = primShape.PathTaperX * 0.01f;
primMesh.taperY = primShape.PathTaperY * 0.01f;
try
{
primMesh.ExtrudeCircular();
}
catch (Exception)
{
return null;
}
}
int numCoords = primMesh.coords.Count;
//int numFaces = primMesh.faces.Count;
List<Coord> coords = primMesh.coords;
for (int i = 0; i < numCoords; i++)
{
Coord c = coords[i];
mesh.vertices.Add(new MeshmerizerVertex(c.X, c.Y, c.Z));
}
mesh.primMesh = primMesh;
// trim the vertex and triangle lists to free up memory
mesh.vertices.TrimExcess();
mesh.triangles.TrimExcess();
return mesh;
}
private MeshmerizerMesh GenerateMeshmerizerMesh(Primitive prim)
{
PrimitiveBaseShape primShape = new PrimitiveBaseShape(prim);
MeshmerizerMesh mesh = new MeshmerizerMesh();
float pathShearX = primShape.PathShearX < 128 ? (float)primShape.PathShearX * 0.01f : (float)(primShape.PathShearX - 256) * 0.01f;
float pathShearY = primShape.PathShearY < 128 ? (float)primShape.PathShearY * 0.01f : (float)(primShape.PathShearY - 256) * 0.01f;
float pathBegin = (float)primShape.PathBegin * 2.0e-5f;
float pathEnd = 1.0f - (float)primShape.PathEnd * 2.0e-5f;
float pathScaleX = (float)(primShape.PathScaleX - 100) * 0.01f;
float pathScaleY = (float)(primShape.PathScaleY - 100) * 0.01f;
float profileBegin = (float)primShape.ProfileBegin * 2.0e-5f;
float profileEnd = 1.0f - (float)primShape.ProfileEnd * 2.0e-5f;
float profileHollow = (float)primShape.ProfileHollow * 2.0e-5f;
int sides = 4;
if ((primShape.ProfileCurve & 0x07) == (byte)ProfileShape.EquilateralTriangle)
{
sides = 3;
}
else if ((primShape.ProfileCurve & 0x07) == (byte)ProfileShape.Circle)
{
sides = 24;
}
else if ((primShape.ProfileCurve & 0x07) == (byte)ProfileShape.HalfCircle)
{
// half circle, prim is a sphere
sides = 24;
profileBegin = 0.5f * profileBegin + 0.5f;
profileEnd = 0.5f * profileEnd + 0.5f;
}
int hollowSides = sides;
if (primShape.HollowShape == HollowShape.Circle)
{
hollowSides = 24;
}
else if (primShape.HollowShape == HollowShape.Square)
{
hollowSides = 4;
}
else if (primShape.HollowShape == HollowShape.Triangle)
{
hollowSides = 3;
}
PrimMesh primMesh = new PrimMesh(sides, profileBegin, profileEnd, profileHollow, hollowSides);
primMesh.topShearX = pathShearX;
primMesh.topShearY = pathShearY;
primMesh.pathCutBegin = pathBegin;
primMesh.pathCutEnd = pathEnd;
if (primShape.PathCurve == (byte)Extrusion.Straight)
{
primMesh.twistBegin = primShape.PathTwistBegin * 18 / 10;
primMesh.twistEnd = primShape.PathTwist * 18 / 10;
primMesh.taperX = pathScaleX;
primMesh.taperY = pathScaleY;
try
{
primMesh.ExtrudeLinear();
}
catch (Exception)
{
return(null);
}
}
else
{
primMesh.holeSizeX = (200 - primShape.PathScaleX) * 0.01f;
primMesh.holeSizeY = (200 - primShape.PathScaleY) * 0.01f;
primMesh.radius = 0.01f * primShape.PathRadiusOffset;
primMesh.revolutions = 1.0f + 0.015f * primShape.PathRevolutions;
primMesh.skew = 0.01f * primShape.PathSkew;
primMesh.twistBegin = primShape.PathTwistBegin * 36 / 10;
primMesh.twistEnd = primShape.PathTwist * 36 / 10;
primMesh.taperX = primShape.PathTaperX * 0.01f;
primMesh.taperY = primShape.PathTaperY * 0.01f;
try
{
primMesh.ExtrudeCircular();
}
catch (Exception)
{
return(null);
}
}
int numCoords = primMesh.coords.Count;
//int numFaces = primMesh.faces.Count;
List <Coord> coords = primMesh.coords;
for (int i = 0; i < numCoords; i++)
{
Coord c = coords[i];
mesh.vertices.Add(new MeshmerizerVertex(c.X, c.Y, c.Z));
}
mesh.primMesh = primMesh;
// trim the vertex and triangle lists to free up memory
mesh.vertices.TrimExcess();
mesh.triangles.TrimExcess();
return(mesh);
}
/// <summary>
/// Creates an extrusion of a profile along a linear path. Used to create prim types box, cylinder, and prism.
/// </summary>
/// <param name="m"></param>
/// <returns>A mesh of the extruded shape</returns>
public MeshmerizerMesh ExtrudeLinearPath(MeshmerizerMesh m)
{
MeshmerizerMesh result = new MeshmerizerMesh();
MeshmerizerMesh newLayer;
MeshmerizerMesh lastLayer = null;
int step = 0;
int steps = 1;
float twistTotal = twistTop - twistBot;
// if the profile has a lot of twist, add more layers otherwise the layers may overlap
// and the resulting mesh may be quite inaccurate. This method is arbitrary and may not
// accurately match the viewer
float twistTotalAbs = System.Math.Abs(twistTotal);
if (twistTotalAbs > 0.01)
{
steps += (int)(twistTotalAbs * 3.66f); // dahlia's magic number ;)
}
double percentOfPathMultiplier = 1.0 / steps;
float start = -0.5f;
float stepSize = 1.0f / (float)steps;
float xProfileScale = 1.0f;
float yProfileScale = 1.0f;
float xOffset = 0.0f;
float yOffset = 0.0f;
float zOffset = start;
float xOffsetStepIncrement = pushX / steps;
float yOffsetStepIncrement = pushY / steps;
//float percentOfPath = 0.0f;
float percentOfPath = (float)pathBegin * 2.0e-5f;
zOffset += percentOfPath;
bool done = false;
do // loop through the length of the path and add the layers
{
newLayer = m.Clone();
if (taperBotFactorX < 1.0f)
{
xProfileScale = 1.0f - (1.0f - percentOfPath) * (1.0f - taperBotFactorX);
}
else if (taperTopFactorX < 1.0f)
{
xProfileScale = 1.0f - percentOfPath * (1.0f - taperTopFactorX);
}
else
{
xProfileScale = 1.0f;
}
if (taperBotFactorY < 1.0f)
{
yProfileScale = 1.0f - (1.0f - percentOfPath) * (1.0f - taperBotFactorY);
}
else if (taperTopFactorY < 1.0f)
{
yProfileScale = 1.0f - percentOfPath * (1.0f - taperTopFactorY);
}
else
{
yProfileScale = 1.0f;
}
MeshmerizerVertex vTemp = new MeshmerizerVertex(0.0f, 0.0f, 0.0f);
// apply the taper to the profile before any rotations
if (xProfileScale != 1.0f || yProfileScale != 1.0f)
{
foreach (MeshmerizerVertex v in newLayer.vertices)
{
if (v != null)
{
v.X *= xProfileScale;
v.Y *= yProfileScale;
}
}
}
float twist = twistBot + (twistTotal * (float)percentOfPath);
// apply twist rotation to the profile layer and position the layer in the prim
Quaternion profileRot = Quaternion.CreateFromAxisAngle(new Vector3(0.0f, 0.0f, 1.0f), twist);
foreach (MeshmerizerVertex v in newLayer.vertices)
{
if (v != null)
{
vTemp = v * profileRot;
v.X = vTemp.X + xOffset;
v.Y = vTemp.Y + yOffset;
v.Z = vTemp.Z + zOffset;
}
}
if (step == 0) // the first layer, invert normals
{
foreach (Triangle t in newLayer.triangles)
{
t.invertNormal();
}
}
result.Append(newLayer);
int iLastNull = 0;
if (lastLayer != null)
{
int i, count = newLayer.vertices.Count;
for (i = 0; i < count; i++)
{
int iNext = (i + 1);
if (lastLayer.vertices[i] == null) // cant make a simplex here
{
iLastNull = i + 1;
}
else
{
if (i == count - 1) // End of list
{
iNext = iLastNull;
}
if (lastLayer.vertices[iNext] == null) // Null means wrap to begin of last segment
{
iNext = iLastNull;
}
result.Add(new Triangle(newLayer.vertices[i], lastLayer.vertices[i], newLayer.vertices[iNext]));
result.Add(new Triangle(newLayer.vertices[iNext], lastLayer.vertices[i], lastLayer.vertices[iNext]));
}
}
}
lastLayer = newLayer;
// calc the step for the next interation of the loop
if (step < steps)
{
step++;
percentOfPath += (float)percentOfPathMultiplier;
xOffset += xOffsetStepIncrement;
yOffset += yOffsetStepIncrement;
zOffset += stepSize;
if (percentOfPath > 1.0f - (float)pathEnd * 2.0e-5f)
{
done = true;
}
}
else
{
done = true;
}
} while (!done); // loop until all the layers in the path are completed
return(result);
}
/// <summary>
/// Extrudes a shape around a circular path. Used to create prim types torus, ring, and tube.
/// </summary>
/// <param name="m"></param>
/// <returns>a mesh of the extruded shape</returns>
public MeshmerizerMesh ExtrudeCircularPath(MeshmerizerMesh m)
{
MeshmerizerMesh result = new MeshmerizerMesh();
MeshmerizerMesh newLayer;
MeshmerizerMesh lastLayer = null;
int step;
int steps = 24;
float twistTotal = twistTop - twistBot;
// if the profile has a lot of twist, add more layers otherwise the layers may overlap
// and the resulting mesh may be quite inaccurate. This method is arbitrary and doesn't
// accurately match the viewer
if (System.Math.Abs(twistTotal) > (float)System.Math.PI * 1.5f)
{
steps *= 2;
}
if (System.Math.Abs(twistTotal) > (float)System.Math.PI * 3.0f)
{
steps *= 2;
}
// double percentOfPathMultiplier = 1.0 / steps;
// double angleStepMultiplier = System.Math.PI * 2.0 / steps;
float yPathScale = pathScaleY * 0.5f;
float pathLength = pathCutEnd - pathCutBegin;
float totalSkew = skew * 2.0f * pathLength;
float skewStart = (-skew) + pathCutBegin * 2.0f * skew;
// It's not quite clear what pushY (Y top shear) does, but subtracting it from the start and end
// angles appears to approximate it's effects on path cut. Likewise, adding it to the angle used
// to calculate the sine for generating the path radius appears to approximate it's effects there
// too, but there are some subtle differences in the radius which are noticeable as the prim size
// increases and it may affect megaprims quite a bit. The effect of the Y top shear parameter on
// the meshes generated with this technique appear nearly identical in shape to the same prims when
// displayed by the viewer.
float startAngle = (float)(System.Math.PI * 2.0 * pathCutBegin * revolutions) - pushY * 0.9f;
float endAngle = (float)(System.Math.PI * 2.0 * pathCutEnd * revolutions) - pushY * 0.9f;
float stepSize = (float)0.2617993878; // 2*PI / 24 segments per revolution
step = (int)(startAngle / stepSize);
float angle = startAngle;
float xProfileScale = 1.0f;
float yProfileScale = 1.0f;
bool done = false;
do // loop through the length of the path and add the layers
{
newLayer = m.Clone();
float percentOfPath = (angle - startAngle) / (endAngle - startAngle); // endAngle should always be larger than startAngle
if (pathTaperX > 0.001f) // can't really compare to 0.0f as the value passed is never exactly zero
{
xProfileScale = 1.0f - percentOfPath * pathTaperX;
}
else if (pathTaperX < -0.001f)
{
xProfileScale = 1.0f + (1.0f - percentOfPath) * pathTaperX;
}
else
{
xProfileScale = 1.0f;
}
if (pathTaperY > 0.001f)
{
yProfileScale = 1.0f - percentOfPath * pathTaperY;
}
else if (pathTaperY < -0.001f)
{
yProfileScale = 1.0f + (1.0f - percentOfPath) * pathTaperY;
}
else
{
yProfileScale = 1.0f;
}
MeshmerizerVertex vTemp = new MeshmerizerVertex(0.0f, 0.0f, 0.0f);
// apply the taper to the profile before any rotations
if (xProfileScale != 1.0f || yProfileScale != 1.0f)
{
foreach (MeshmerizerVertex v in newLayer.vertices)
{
if (v != null)
{
v.X *= xProfileScale;
v.Y *= yProfileScale;
}
}
}
float radiusScale;
if (radius > 0.001f)
{
radiusScale = 1.0f - radius * percentOfPath;
}
else if (radius < 0.001f)
{
radiusScale = 1.0f + radius * (1.0f - percentOfPath);
}
else
{
radiusScale = 1.0f;
}
float twist = twistBot + (twistTotal * (float)percentOfPath);
float xOffset;
float yOffset;
float zOffset;
xOffset = 0.5f * (skewStart + totalSkew * (float)percentOfPath);
xOffset += (float)System.Math.Sin(angle) * pushX * 0.45f;
yOffset = (float)(System.Math.Cos(angle) * (0.5f - yPathScale)) * radiusScale;
zOffset = (float)(System.Math.Sin(angle + pushY * 0.9f) * (0.5f - yPathScale)) * radiusScale;
// next apply twist rotation to the profile layer
if (twistTotal != 0.0f || twistBot != 0.0f)
{
Quaternion profileRot = new Quaternion(new Vector3(0.0f, 0.0f, 1.0f), twist);
foreach (MeshmerizerVertex v in newLayer.vertices)
{
if (v != null)
{
vTemp = v * profileRot;
v.X = vTemp.X;
v.Y = vTemp.Y;
v.Z = vTemp.Z;
}
}
}
// now orient the rotation of the profile layer relative to it's position on the path
// adding pushY to the angle used to generate the quat appears to approximate the viewer
Quaternion layerRot = Quaternion.CreateFromAxisAngle(new Vector3(1.0f, 0.0f, 0.0f), (float)angle + pushY * 0.9f);
foreach (MeshmerizerVertex v in newLayer.vertices)
{
if (v != null)
{
vTemp = v * layerRot;
v.X = vTemp.X + xOffset;
v.Y = vTemp.Y + yOffset;
v.Z = vTemp.Z + zOffset;
}
}
if (angle == startAngle) // the first layer, invert normals
{
foreach (Triangle t in newLayer.triangles)
{
t.invertNormal();
}
}
result.Append(newLayer);
int iLastNull = 0;
if (lastLayer != null)
{
int i, count = newLayer.vertices.Count;
for (i = 0; i < count; i++)
{
int iNext = (i + 1);
if (lastLayer.vertices[i] == null) // cant make a simplex here
{
iLastNull = i + 1;
}
else
{
if (i == count - 1) // End of list
{
iNext = iLastNull;
}
if (lastLayer.vertices[iNext] == null) // Null means wrap to begin of last segment
{
iNext = iLastNull;
}
result.Add(new Triangle(newLayer.vertices[i], lastLayer.vertices[i], newLayer.vertices[iNext]));
result.Add(new Triangle(newLayer.vertices[iNext], lastLayer.vertices[i], lastLayer.vertices[iNext]));
}
}
}
lastLayer = newLayer;
// calc the angle for the next interation of the loop
if (angle >= endAngle)
{
done = true;
}
else
{
angle = stepSize * ++step;
if (angle > endAngle)
{
angle = endAngle;
}
}
} while (!done); // loop until all the layers in the path are completed
return(result);
}
