private void Update(EvaluationContext context)
{
try
{
var resourceManager = ResourceManager.Instance();
var lowerRadius = Radius.GetValue(context);
var upperRadius = lowerRadius + RadiusOffset.GetValue(context);
var height = Height.GetValue(context);
var rows = Rows.GetValue(context).Clamp(1, 10000);
var columns = Columns.GetValue(context).Clamp(1, 10000);
var c = Center.GetValue(context);
var center = new SharpDX.Vector3(c.X, c.Y, c.Z);
var spinInRad = Spin.GetValue(context) * MathUtils.ToRad;
var twistInRad = Twist.GetValue(context) * MathUtils.ToRad;
var basePivot = BasePivot.GetValue(context);
var fillRatio = Fill.GetValue(context) / 360f;
var capSegments = CapSegments.GetValue(context).Clamp(0, 1000);
var addCaps = capSegments > 0;
//var isHullClosed = true; //Math.Abs(fillRatio - 1) < 0.01f;
var isFlipped = lowerRadius < 0;
var vertexHullColumns = columns + 1;
var hullVerticesCount = (rows + 1) * vertexHullColumns;
var hullTriangleCount = rows * columns * 2;
var capsVertexCount = +2 * (capSegments * vertexHullColumns + 1);
var capsTriangleCount = 2 * ((capSegments - 1) * columns * 2 + columns);
var totalVertexCount = hullVerticesCount + (addCaps ? capsVertexCount : 0);
var totalTriangleCount = hullTriangleCount + (addCaps ? capsTriangleCount : 0);
// Create buffers
if (_vertexBufferData.Length != totalVertexCount)
{
_vertexBufferData = new PbrVertex[totalVertexCount];
}
if (_indexBufferData.Length != totalTriangleCount)
{
_indexBufferData = new SharpDX.Int3[totalTriangleCount];
}
// Initialize
var radiusAngleFraction = fillRatio / (vertexHullColumns - 1) * 2.0 * Math.PI;
var rowStep = height / rows;
// Hull
for (var rowIndex = 0; rowIndex < rows + 1; ++rowIndex)
{
var heightFraction = rowIndex / (float)rows;
var rowRadius = MathUtils.Lerp(lowerRadius, upperRadius, heightFraction);
var nextRowRadius = MathUtils.Lerp(lowerRadius, upperRadius, (rowIndex + 1) / (float)rows);
var rowLevel = height * (heightFraction - basePivot);
var rowCenter = new SharpDX.Vector3(0, rowLevel, 0);
for (var columnIndex = 0; columnIndex < vertexHullColumns; ++columnIndex)
{
var columnAngle = columnIndex * radiusAngleFraction + spinInRad + twistInRad * heightFraction + Math.PI;
var u0 = columnIndex / (float)columns;
var u1 = (columnIndex + 1) / (float)rows;
var v0 = addCaps ? ((rowIndex + 1) / (float)rows) / 2f
: (rowIndex + 1) / (float)rows;
var v1 = addCaps ? (rowIndex / (float)rows) / 2f
: rowIndex / (float)rows;
var p = new SharpDX.Vector3((float)Math.Sin(columnAngle) * rowRadius,
rowLevel,
(float)Math.Cos(columnAngle) * rowRadius);
var p1 = new SharpDX.Vector3((float)Math.Sin(columnAngle) * rowRadius,
rowLevel + rowStep,
(float)Math.Cos(columnAngle) * rowRadius
);
var p2 = new SharpDX.Vector3((float)Math.Sin(columnAngle + radiusAngleFraction) * nextRowRadius,
rowLevel,
(float)Math.Cos(columnAngle + radiusAngleFraction) * nextRowRadius
);
var uv0 = new SharpDX.Vector2(u0, v1);
var uv1 = new SharpDX.Vector2(u1, v1);
var uv2 = new SharpDX.Vector2(u1, v0);
var normal0 = SharpDX.Vector3.Normalize(p - rowCenter);
MeshUtils.CalcTBNSpace(p, uv0, p1, uv1, p2, uv2, normal0, out var tangent0, out var binormal0);
var vertexIndex = rowIndex * vertexHullColumns + columnIndex;
_vertexBufferData[vertexIndex] = new PbrVertex
{
Position = p + center,
Normal = isFlipped ? normal0 * -1 : normal0,
Tangent = tangent0,
Bitangent = isFlipped ? binormal0 * -1 : binormal0,
Texcoord = uv0,
Selection = 1
};
var faceIndex = 2 * (rowIndex * (vertexHullColumns - 1) + columnIndex);
if (columnIndex < vertexHullColumns - 1 && rowIndex < rows)
{
if (isFlipped)
{
_indexBufferData[faceIndex + 0] = new SharpDX.Int3(vertexIndex + vertexHullColumns, vertexIndex + 1, vertexIndex + 0);
_indexBufferData[faceIndex + 1] =
new SharpDX.Int3(vertexIndex + vertexHullColumns + 1, vertexIndex + 1, vertexIndex + vertexHullColumns);
}
else
{
_indexBufferData[faceIndex + 0] = new SharpDX.Int3(vertexIndex + 0, vertexIndex + 1, vertexIndex + vertexHullColumns);
_indexBufferData[faceIndex + 1] =
new SharpDX.Int3(vertexIndex + vertexHullColumns, vertexIndex + 1, vertexIndex + vertexHullColumns + 1);
}
}
}
}
// Caps
if (addCaps)
{
for (var capIndex = 0; capIndex <= 1; capIndex++)
{
var isLowerCap = capIndex == 0;
var capLevel = ((isLowerCap ? 0 : 1) - basePivot) * height;
var capRadius = isLowerCap ? lowerRadius : upperRadius;
var isReverse = isFlipped ^ isLowerCap;
var centerVertexIndex = hullVerticesCount + (capsVertexCount / 2) * (capIndex + 1) - 1;
for (var capSegmentIndex = 0; capSegmentIndex < capSegments; ++capSegmentIndex)
{
var isCenterSegment = capSegmentIndex == capSegments - 1;
var capFraction = 1f - (capSegmentIndex) / (float)capSegments;
var nextCapFraction = 1f - (capSegmentIndex + 1) / (float)capSegments;
var radius = upperRadius * capFraction;
var nextRadius = upperRadius * nextCapFraction;
for (var columnIndex = 0; columnIndex < vertexHullColumns; ++columnIndex)
{
var columnAngle = columnIndex * radiusAngleFraction + spinInRad + twistInRad * (isLowerCap ? 0 : 1) + Math.PI;
var xx = (float)Math.Sin(columnAngle);
var yy = (float)Math.Cos(columnAngle);
var p = new SharpDX.Vector3(-xx * radius,
capLevel,
-yy * radius);
var normal0 = isLowerCap ? SharpDX.Vector3.Down : SharpDX.Vector3.Up;
var tangent0 = SharpDX.Vector3.Left;
var binormal0 = SharpDX.Vector3.ForwardRH;
var vertexIndex = capSegmentIndex * vertexHullColumns + columnIndex
+ hullVerticesCount + (capsVertexCount / 2) * capIndex;
// Write vertex
var capUvOffset = isLowerCap
? new SharpDX.Vector2(-0.25f, -0.25f)
: new SharpDX.Vector2(0.25f, -0.25f);
_vertexBufferData[vertexIndex] = new PbrVertex
{
Position = p + center,
Normal = isFlipped ? normal0 * -1 : normal0,
Tangent = tangent0,
Bitangent = isFlipped ? binormal0 * -1 : binormal0,
Texcoord = new SharpDX.Vector2(-xx * (isLowerCap ? -1 : 1), yy) * capFraction / 4 + capUvOffset,
Selection = 1
};
if (isCenterSegment)
{
if (columnIndex == 0)
{
_vertexBufferData[centerVertexIndex] = new PbrVertex
{
Position = new SharpDX.Vector3(0, capLevel, 0) + center,
Normal = (isFlipped) ? normal0 * -1 : normal0,
Tangent = tangent0,
Bitangent = (isFlipped ^ isLowerCap) ? binormal0 * -1 : binormal0,
Texcoord = capUvOffset,
Selection = 1
};
}
}
if (columnIndex < vertexHullColumns - 1 && capSegmentIndex < capSegments)
{
if (isCenterSegment)
{
var faceIndex = (capSegmentIndex * (vertexHullColumns - 1) * 2 + columnIndex)
+ hullTriangleCount + (capsTriangleCount / 2) * capIndex;
var f1 = isReverse
? new SharpDX.Int3(vertexIndex + 1, vertexIndex, centerVertexIndex)
: new SharpDX.Int3(centerVertexIndex, vertexIndex, vertexIndex + 1);
_indexBufferData[faceIndex] = f1;
}
else
{
var faceIndex = (capSegmentIndex * (vertexHullColumns - 1) * 2) + columnIndex * 2
+ hullTriangleCount +
(capsTriangleCount / 2) * capIndex;
_indexBufferData[faceIndex]
= isReverse
? new SharpDX.Int3(vertexIndex + vertexHullColumns, vertexIndex + 1, vertexIndex)
: new SharpDX.Int3(vertexIndex, vertexIndex + 1, vertexIndex + vertexHullColumns);
_indexBufferData[faceIndex + 1]
= isReverse
? new SharpDX.Int3(vertexIndex + vertexHullColumns, vertexIndex + vertexHullColumns + 1, vertexIndex + 1)
: new SharpDX.Int3(vertexIndex + 1, vertexIndex + vertexHullColumns + 1, vertexIndex + vertexHullColumns);
}
}
}
}
}
}
// Write Data
_vertexBufferWithViews.Buffer = _vertexBuffer;
resourceManager.SetupStructuredBuffer(_vertexBufferData, PbrVertex.Stride * totalVertexCount, PbrVertex.Stride, ref _vertexBuffer);
resourceManager.CreateStructuredBufferSrv(_vertexBuffer, ref _vertexBufferWithViews.Srv);
resourceManager.CreateStructuredBufferUav(_vertexBuffer, UnorderedAccessViewBufferFlags.None, ref _vertexBufferWithViews.Uav);
_indexBufferWithViews.Buffer = _indexBuffer;
const int stride = 3 * 4;
resourceManager.SetupStructuredBuffer(_indexBufferData, stride * totalTriangleCount, stride, ref _indexBuffer);
resourceManager.CreateStructuredBufferSrv(_indexBuffer, ref _indexBufferWithViews.Srv);
resourceManager.CreateStructuredBufferUav(_indexBuffer, UnorderedAccessViewBufferFlags.None, ref _indexBufferWithViews.Uav);
_data.VertexBuffer = _vertexBufferWithViews;
_data.IndicesBuffer = _indexBufferWithViews;
Data.Value = _data;
Data.DirtyFlag.Clear();
}
catch (Exception e)
{
Log.Error("Failed to create torus mesh:" + e.Message);
}
}