/// <summary>
/// Builds the bottom side of a cube into this Geometry (Built up of 4 vertices, so texture coordinates and normals are set)
/// </summary>
public static BuiltVerticesRange BuildCubeBottom(this GeometrySurface target, Vector3 start, Vector3 size)
{
var dest = start + size;
return(target.BuildRect(
new Vector3(start.X, start.Y, dest.Z),
new Vector3(dest.X, start.Y, dest.Z),
new Vector3(dest.X, start.Y, start.Z),
new Vector3(start.X, start.Y, start.Z),
new Vector3(0f, -1f, 0f)));
}
/// <summary>
/// Create a 4 Side Pyramid
/// </summary>
public static BuiltVerticesRange BuildPyramid(this GeometrySurface target, float width, float height)
{
width = Math.Max(EngineMath.TOLERANCE_FLOAT_POSITIVE, width);
height = Math.Max(EngineMath.TOLERANCE_FLOAT_POSITIVE, height);
var halfWidth = width / 2f;
var lowerMiddle = new Vector3(0f, -(height / 2f), 0f);
var start = new Vector3(lowerMiddle.X - halfWidth, lowerMiddle.Y, lowerMiddle.Z - halfWidth);
var dest = start + new Vector3(width, 0f, width);
var centerTopCoordination = new Vector3((dest.X + start.X) / 2, start.Y + height, (dest.Z + start.Z) / 2);
target.BuildRect(
new Vector3(start.X, dest.Y, start.Z),
new Vector3(start.X, dest.Y, dest.Z),
new Vector3(dest.X, dest.Y, dest.Z),
new Vector3(dest.X, dest.Y, start.Z),
new Vector3(0f, -1f, 0f));
target.BuildTriangle(
new Vector3(start.X, dest.Y, start.Z),
new Vector3(dest.X, dest.Y, start.Z),
centerTopCoordination);
target.BuildTriangle(
new Vector3(start.X, dest.Y, dest.Z),
new Vector3(start.X, dest.Y, start.Z),
centerTopCoordination);
target.BuildTriangle(
new Vector3(dest.X, dest.Y, dest.Z),
new Vector3(start.X, dest.Y, dest.Z),
centerTopCoordination);
target.BuildTriangle(
new Vector3(dest.X, dest.Y, start.Z),
new Vector3(dest.X, dest.Y, dest.Z),
centerTopCoordination);
return(new BuiltVerticesRange(target.Owner, target.Owner.CountVertices - 4, 4));
}
/// <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));
}
