/// <summary>
/// Builds a cube of 4 vertices and a defined height.
/// </summary>
public static BuiltVerticesRange BuildCube(this GeometrySurface target, Vector3 topA, Vector3 topB, Vector3 topC, Vector3 topD, float height)
{
var result = new BuiltVerticesRange(target.Owner)
{
StartVertex = target.Owner.CountVertices
};
var startTriangleIndex = target.CountTriangles;
// Calculate texture coordinates
var size = new Vector3(
(topB - topA).Length(),
Math.Abs(height),
(topC - topB).Length());
var texX = 1f;
var texY = 1f;
var texZ = 1f;
if (target.IsTextureTileModeEnabled(out var tileSize))
{
texX = size.X / tileSize.X;
texY = size.Y / tileSize.Y;
texZ = size.Z / tileSize.X;
}
// Calculate bottom vectors
var bottomA = new Vector3(topA.X, topA.Y - height, topA.Z);
var bottomB = new Vector3(topB.X, topB.Y - height, topB.Z);
var bottomC = new Vector3(topC.X, topC.Y - height, topC.Z);
var bottomD = new Vector3(topD.X, topD.Y - height, topD.Z);
// Build Top side
var vertex = new VertexBasic(topA, new Vector2(texX, 0f), new Vector3(0f, 1f, 0f));
var a = target.Owner.AddVertex(vertex);
var b = target.Owner.AddVertex(vertex.Copy(topB, new Vector2(texX, texY)));
var c = target.Owner.AddVertex(vertex.Copy(topC, new Vector2(0f, texY)));
var d = target.Owner.AddVertex(vertex.Copy(topD, new Vector2(0f, 0f)));
target.AddTriangle(a, c, b);
target.AddTriangle(a, d, c);
// Build Bottom side
vertex = new VertexBasic(topA, new Vector2(0f, 0f), new Vector3(0f, -1f, 0f));
a = target.Owner.AddVertex(vertex);
b = target.Owner.AddVertex(vertex.Copy(topD, new Vector2(texX, 0f)));
c = target.Owner.AddVertex(vertex.Copy(topC, new Vector2(texX, texY)));
d = target.Owner.AddVertex(vertex.Copy(topB, new Vector2(0f, texY)));
target.AddTriangle(a, c, b);
target.AddTriangle(a, d, c);
// Build Front side
vertex = new VertexBasic(topA, new Vector2(0f, texY), new Vector3(0f, 0f, -1f));
a = target.Owner.AddVertex(vertex);
b = target.Owner.AddVertex(vertex.Copy(topB, new Vector2(texX, texY)));
c = target.Owner.AddVertex(vertex.Copy(bottomB, new Vector2(texX, 0f)));
d = target.Owner.AddVertex(vertex.Copy(bottomA, new Vector2(0f, 0f)));
target.AddTriangle(a, c, b);
target.AddTriangle(a, d, c);
// Build Right side
a = target.Owner.AddVertex(vertex.Copy(topB, new Vector3(1f, 0f, 0f), new Vector2(0f, texY)));
b = target.Owner.AddVertex(vertex.Copy(topC, new Vector3(1f, 0f, 0f), new Vector2(texZ, texY)));
c = target.Owner.AddVertex(vertex.Copy(bottomC, new Vector3(1f, 0f, 0f), new Vector2(texZ, 0f)));
d = target.Owner.AddVertex(vertex.Copy(bottomB, new Vector3(1f, 0f, 0f), new Vector2(0f, 0f)));
target.AddTriangle(a, c, b);
target.AddTriangle(a, d, c);
// Build Back side
a = target.Owner.AddVertex(vertex.Copy(topC, new Vector3(0f, 0f, 1f), new Vector2(0f, texY)));
b = target.Owner.AddVertex(vertex.Copy(topD, new Vector3(0f, 0f, 1f), new Vector2(texX, texY)));
c = target.Owner.AddVertex(vertex.Copy(bottomD, new Vector3(0f, 0f, 1f), new Vector2(texX, 0f)));
d = target.Owner.AddVertex(vertex.Copy(bottomC, new Vector3(0f, 0f, 1f), new Vector2(0f, 0f)));
target.AddTriangle(a, c, b);
target.AddTriangle(a, d, c);
// Build Left side
a = target.Owner.AddVertex(vertex.Copy(topD, new Vector3(-1f, 0f, 0f), new Vector2(0f, texY)));
b = target.Owner.AddVertex(vertex.Copy(topA, new Vector3(-1f, 0f, 0f), new Vector2(texZ, texY)));
c = target.Owner.AddVertex(vertex.Copy(bottomA, new Vector3(-1f, 0f, 0f), new Vector2(texZ, 0f)));
d = target.Owner.AddVertex(vertex.Copy(bottomD, new Vector3(-1f, 0f, 0f), new Vector2(0f, 0f)));
target.AddTriangle(a, c, b);
target.AddTriangle(a, d, c);
// Calculate normals finally
target.CalculateNormalsFlat(startTriangleIndex, target.CountTriangles - startTriangleIndex);
result.VertexCount = target.Owner.CountVertices - result.StartVertex;
return(result);
}
/// <summary>
/// Builds a cone into the geometry with correct texture coordinates and normals.
/// </summary>
/// <param name="target">Target <see cref="GeometrySurface"/>.</param>
/// <param name="radius">The radius of the cone.</param>
/// <param name="height">The height of the cone.</param>
/// <param name="countOfSegments">Total count of segments to generate.</param>
public static BuiltVerticesRange BuildCone(this GeometrySurface target, float radius, float height, int countOfSegments)
{
var startVertex = target.Owner.CountVertices;
radius = Math.Max(EngineMath.TOLERANCE_FLOAT_POSITIVE, radius);
height = Math.Max(EngineMath.TOLERANCE_FLOAT_POSITIVE, height);
countOfSegments = Math.Max(3, countOfSegments);
var diameter = radius * 2f;
// Get texture offsets
var texX = 1f;
var texY = 1f;
if (target.IsTextureTileModeEnabled(out var tileSize))
{
texX = diameter / tileSize.X;
texY = diameter / tileSize.Y;
}
// Specify bottom and top middle coordinates
var bottomCoordinate = new Vector3(0f, -(height / 2f), 0f);
var topCoordinate = new Vector3(bottomCoordinate.X, bottomCoordinate.Y + height, bottomCoordinate.Z);
// Create bottom and top vertices
var bottomVertex = new VertexBasic(bottomCoordinate, new Vector2(texX / 2f, texY / 2f), new Vector3(0f, -1f, 0f));
// AddObject bottom and top vertices to the geometry
var bottomVertexIndex = target.Owner.AddVertex(bottomVertex);
// Generate all segments
var countOfSegmentsF = (float)countOfSegments;
for (var loop = 0; loop < countOfSegments; loop++)
{
// Calculate rotation values for each segment border
var startRadian = EngineMath.RAD_360DEG * (loop / countOfSegmentsF);
var targetRadian = EngineMath.RAD_360DEG * ((loop + 1) / countOfSegmentsF);
var normalRadian = startRadian + (targetRadian - startRadian) / 2f;
// Generate all normals
var sideNormal = Vector3Ex.NormalFromHVRotation(normalRadian, 0f);
var sideLeftNormal = Vector3Ex.NormalFromHVRotation(startRadian, 0f);
var sideRightNormal = Vector3Ex.NormalFromHVRotation(targetRadian, 0f);
//Generate all points
var sideLeftBottomCoord = bottomCoordinate + sideLeftNormal * radius;
var sideRightBottomCoord = bottomCoordinate + sideRightNormal * radius;
var sideMiddleBottomCoord = bottomCoordinate + sideNormal * radius;
var sideLeftTexCoord = new Vector2(
texX / (diameter / (sideLeftBottomCoord.X + radius)),
texY / (diameter / (sideLeftBottomCoord.Z + radius)));
var sideRightTexCoord = new Vector2(
texX / (diameter / (sideRightBottomCoord.X + radius)),
texY / (diameter / (sideRightBottomCoord.Z + radius)));
//AddObject segment bottom triangle
var segmentBottomLeft = bottomVertex.Copy(sideLeftBottomCoord, sideLeftTexCoord);
var segmentBottomRight = bottomVertex.Copy(sideRightBottomCoord, sideRightTexCoord);
target.AddTriangle(
bottomVertexIndex, target.Owner.AddVertex(segmentBottomLeft), target.Owner.AddVertex(segmentBottomRight));
//Generate side normal
var vectorToTop = topCoordinate - sideMiddleBottomCoord;
var vectorToTopRotation = Vector3Ex.ToHVRotation(vectorToTop);
vectorToTopRotation.Y = vectorToTopRotation.Y + EngineMath.RAD_90DEG;
var topSideNormal = Vector3Ex.NormalFromHVRotation(vectorToTopRotation);
//AddObject segment top triangle
var topVertex = new VertexBasic(topCoordinate, new Vector2(texX / 2f, texY / 2f), topSideNormal);
var segmentTopLeft = topVertex.Copy(sideLeftBottomCoord, sideLeftTexCoord);
var segmentTopRight = topVertex.Copy(sideRightBottomCoord, sideRightTexCoord);
target.AddTriangle(target.Owner.AddVertex(topVertex), target.Owner.AddVertex(segmentTopRight), target.Owner.AddVertex(segmentTopLeft));
}
return(new BuiltVerticesRange(target.Owner, startVertex, target.Owner.CountVertices - startVertex));
}
/// <summary>
/// Builds cube sides into this Geometry (these sides are built up of 16 vertices, so texture coordinates and normals are set)
/// </summary>
/// <param name="target">Target <see cref="GeometrySurface"/>.</param>
/// <param name="start">Start point of the cube</param>
/// <param name="size">Size of the cube</param>
public static BuiltVerticesRange BuildCubeSides(this GeometrySurface target, Vector3 start, Vector3 size)
{
var result = new BuiltVerticesRange(target.Owner)
{
StartVertex = target.Owner.CountVertices
};
var dest = start + size;
var texX = 1f;
var texY = 1f;
var texZ = 1f;
if (target.IsTextureTileModeEnabled(out var tileSize))
{
texX = size.X / tileSize.X;
texY = size.Y / tileSize.Y;
texZ = size.Z / tileSize.X;
}
//Front side
var vertex = new VertexBasic(start, new Vector2(0f, texY), new Vector3(0f, 0f, -1f));
var a = target.Owner.AddVertex(vertex);
var b = target.Owner.AddVertex(vertex.Copy(new Vector3(dest.X, start.Y, start.Z), new Vector2(texX, texY)));
var c = target.Owner.AddVertex(vertex.Copy(new Vector3(dest.X, dest.Y, start.Z), new Vector2(texX, 0f)));
var d = target.Owner.AddVertex(vertex.Copy(new Vector3(start.X, dest.Y, start.Z), new Vector2(0f, 0f)));
target.AddTriangle(a, c, b);
target.AddTriangle(a, d, c);
//Right side
a = target.Owner.AddVertex(vertex.Copy(new Vector3(dest.X, start.Y, start.Z), new Vector3(1f, 0f, 0f), new Vector2(0f, texY)));
b = target.Owner.AddVertex(vertex.Copy(new Vector3(dest.X, start.Y, dest.Z), new Vector3(1f, 0f, 0f), new Vector2(texZ, texY)));
c = target.Owner.AddVertex(vertex.Copy(new Vector3(dest.X, dest.Y, dest.Z), new Vector3(1f, 0f, 0f), new Vector2(texZ, 0f)));
d = target.Owner.AddVertex(vertex.Copy(new Vector3(dest.X, dest.Y, start.Z), new Vector3(1f, 0f, 0f), new Vector2(0f, 0f)));
target.AddTriangle(a, c, b);
target.AddTriangle(a, d, c);
//Back side
a = target.Owner.AddVertex(vertex.Copy(new Vector3(dest.X, start.Y, dest.Z), new Vector3(0f, 0f, 1f), new Vector2(0f, texY)));
b = target.Owner.AddVertex(vertex.Copy(new Vector3(start.X, start.Y, dest.Z), new Vector3(0f, 0f, 1f), new Vector2(texX, texY)));
c = target.Owner.AddVertex(vertex.Copy(new Vector3(start.X, dest.Y, dest.Z), new Vector3(0f, 0f, 1f), new Vector2(texX, 0f)));
d = target.Owner.AddVertex(vertex.Copy(new Vector3(dest.X, dest.Y, dest.Z), new Vector3(0f, 0f, 1f), new Vector2(0f, 0f)));
target.AddTriangle(a, c, b);
target.AddTriangle(a, d, c);
//Left side
a = target.Owner.AddVertex(vertex.Copy(new Vector3(start.X, start.Y, dest.Z), new Vector3(-1f, 0f, 0f), new Vector2(0f, texY)));
b = target.Owner.AddVertex(vertex.Copy(new Vector3(start.X, start.Y, start.Z), new Vector3(-1f, 0f, 0f), new Vector2(texZ, texY)));
c = target.Owner.AddVertex(vertex.Copy(new Vector3(start.X, dest.Y, start.Z), new Vector3(-1f, 0f, 0f), new Vector2(texZ, 0f)));
d = target.Owner.AddVertex(vertex.Copy(new Vector3(start.X, dest.Y, dest.Z), new Vector3(-1f, 0f, 0f), new Vector2(0f, 0f)));
target.AddTriangle(a, c, b);
target.AddTriangle(a, d, c);
result.VertexCount = target.Owner.CountVertices - result.StartVertex;
return(result);
}
/// <summary>
/// Builds a cylinder into the geometry with correct texture coordinates and normals.
/// </summary>
/// <param name="target">Target <see cref="GeometrySurface"/>.</param>
/// <param name="bottomMiddle">Coordinate of bottom middle.</param>
/// <param name="radius">The radius of the cylinder.</param>
/// <param name="height">The height of the cylinder.</param>
/// <param name="countOfSegments">Total count of segments to generate.</param>
/// <param name="buildBottom">Build bottom of the cylinder.</param>
/// <param name="buildSides">Build sides of the cylinder.</param>
/// <param name="buildTop">Build top side of the cylinder.</param>
public static BuiltVerticesRange BuildCylinder(
this GeometrySurface target,
Vector3 bottomMiddle, float radius, float height, int countOfSegments,
bool buildSides, bool buildBottom, bool buildTop)
{
var startVertex = target.Owner.CountVertices;
radius = Math.Max(EngineMath.TOLERANCE_FLOAT_POSITIVE, radius);
height = Math.Max(EngineMath.TOLERANCE_FLOAT_POSITIVE, height);
countOfSegments = Math.Max(3, countOfSegments);
var diameter = radius * 2f;
// Get texture offsets
var texX = 1f;
var texY = 1f;
var texSegmentY = 1f;
var texSegmentX = 1f;
if (target.IsTextureTileModeEnabled(out var tileSize))
{
texX = diameter / tileSize.X;
texY = diameter / tileSize.Y;
texSegmentY = height / tileSize.Y;
texSegmentX = EngineMath.RAD_180DEG * diameter / tileSize.X;
}
// Specify bottom and top middle coordinates
var bottomCoordinate = bottomMiddle;
var topCoordinate = new Vector3(bottomMiddle.X, bottomMiddle.Y + height, bottomMiddle.Z);
// Create bottom and top vertices
var bottomVertex = new VertexBasic(bottomCoordinate, new Vector2(texX / 2f, texY / 2f), new Vector3(0f, -1f, 0f));
var topVertex = new VertexBasic(topCoordinate, new Vector2(texX / 2f, texY / 2f), new Vector3(0f, 1f, 0f));
// AddObject bottom and top vertices to the geometry
var bottomVertexIndex = target.Owner.AddVertex(bottomVertex);
var topVertexIndex = target.Owner.AddVertex(topVertex);
// Generate all segments
var fullRadian = EngineMath.RAD_360DEG;
var countOfSegmentsF = (float)countOfSegments;
for (var loop = 0; loop < countOfSegments; loop++)
{
// Calculate rotation values for each segment border
var startRadian = fullRadian * (loop / countOfSegmentsF);
var targetRadian = fullRadian * ((loop + 1) / countOfSegmentsF);
var normalRadian = startRadian + (targetRadian - startRadian) / 2f;
// Generate all normals
var sideNormal = Vector3Ex.NormalFromHVRotation(normalRadian, 0f);
var sideLeftNormal = Vector3Ex.NormalFromHVRotation(startRadian, 0f);
var sideRightNormal = Vector3Ex.NormalFromHVRotation(targetRadian, 0f);
//
var sideLeftTexCoord = new Vector2(0.5f + sideLeftNormal.X * radius, 0.5f + sideLeftNormal.Z * radius);
var sideRightTexCoord = new Vector2(0.5f + sideRightNormal.X * radius, 0.5f + sideRightNormal.Z * radius);
// Generate all points
var sideLeftBottomCoord = bottomCoordinate + sideLeftNormal * radius;
var sideRightBottomCoord = bottomCoordinate + sideRightNormal * radius;
var sideLeftTopCoord = new Vector3(sideLeftBottomCoord.X, sideLeftBottomCoord.Y + height, sideLeftBottomCoord.Z);
var sideRightTopCoord = new Vector3(sideRightBottomCoord.X, sideRightBottomCoord.Y + height, sideRightBottomCoord.Z);
// AddObject segment bottom triangle
if (buildBottom)
{
var segmentBottomLeft = bottomVertex.Copy(sideLeftBottomCoord, sideLeftTexCoord);
var segmentBottomRight = bottomVertex.Copy(sideRightBottomCoord, sideRightTexCoord);
target.AddTriangle(
bottomVertexIndex, target.Owner.AddVertex(segmentBottomLeft), target.Owner.AddVertex(segmentBottomRight));
}
// AddObject segment top triangle
if (buildTop)
{
var segmentTopLeft = topVertex.Copy(sideLeftTopCoord, sideLeftTexCoord);
var segmentTopRight = topVertex.Copy(sideRightTopCoord, sideRightTexCoord);
target.AddTriangle(
topVertexIndex, target.Owner.AddVertex(segmentTopRight), target.Owner.AddVertex(segmentTopLeft));
}
if (buildSides)
{
// Calculate texture coords for side segment
var texCoordSegmentStart = new Vector2(texSegmentX * (loop / (float)countOfSegments), 0f);
var texCoordSegmentTarget = new Vector2(texSegmentX * ((loop + 1) / (float)countOfSegments), texSegmentY);
// AddObject segment side
target.BuildRect(sideLeftBottomCoord, sideRightBottomCoord, sideRightTopCoord, sideLeftTopCoord, sideNormal, texCoordSegmentStart, texCoordSegmentTarget);
}
}
return(new BuiltVerticesRange(target.Owner, startVertex, target.Owner.CountVertices - startVertex));
}