// possible situations:
// capsule with top AND bottom set to >0 height
// capsule with top OR bottom set to 0 height
// capsule with both top AND bottom set to 0 height
// capsule with height equal to top and bottom height
public static bool GenerateCapsuleVertices(ref CSGCapsuleDefinition definition, ref Vector3[] vertices)
{
definition.Validate();
var haveTopHemisphere = definition.haveRoundedTop;
var haveBottomHemisphere = definition.haveRoundedBottom;
var haveMiddleCylinder = definition.haveCylinder;
if (!haveBottomHemisphere && !haveTopHemisphere && !haveMiddleCylinder)
{
return(false);
}
var radiusX = definition.diameterX * 0.5f;
var radiusZ = definition.diameterZ * 0.5f;
var topHeight = haveTopHemisphere ? definition.topHeight : 0;
var bottomHeight = haveBottomHemisphere ? definition.bottomHeight : 0;
var totalHeight = definition.height;
var cylinderHeight = definition.cylinderHeight;
var sides = definition.sides;
var extraVertices = definition.extraVertexCount;
var bottomRings = definition.bottomRingCount;
var topRings = definition.topRingCount;
var ringCount = definition.ringCount;
var vertexCount = definition.vertexCount;
var bottomVertex = definition.bottomVertex;
var topVertex = definition.topVertex;
var topOffset = definition.topOffset + definition.offsetY;
var bottomOffset = definition.bottomOffset + definition.offsetY;
if (vertices == null ||
vertices.Length != vertexCount)
{
vertices = new Vector3[vertexCount];
}
if (haveBottomHemisphere)
{
vertices[bottomVertex] = Vector3.up * (bottomOffset - bottomHeight); // bottom
}
if (haveTopHemisphere)
{
vertices[topVertex] = Vector3.up * (topOffset + topHeight); // top
}
var degreePerSegment = (360.0f / sides) * Mathf.Deg2Rad;
var angleOffset = definition.rotation + (((sides & 1) == 1) ? 0.0f : 0.5f * degreePerSegment);
var topVertexOffset = extraVertices + ((topRings - 1) * sides);
var bottomVertexOffset = extraVertices + ((ringCount - bottomRings) * sides);
var unitCircleOffset = topVertexOffset;
var vertexIndex = unitCircleOffset;
{
for (int h = sides - 1; h >= 0; h--, vertexIndex++)
{
var hRad = (h * degreePerSegment) + angleOffset;
vertices[vertexIndex] = new Vector3(Mathf.Cos(hRad) * radiusX,
0.0f,
Mathf.Sin(hRad) * radiusZ);
}
}
for (int v = 1; v < topRings; v++)
{
vertexIndex = topVertexOffset - (v * sides);
var segmentFactor = ((v - (topRings * 0.5f)) / topRings) + 0.5f; // [0.0f ... 1.0f]
var segmentDegree = (segmentFactor * 90); // [0 .. 90]
var segmentHeight = topOffset +
(Mathf.Sin(segmentDegree * Mathf.Deg2Rad) *
topHeight);
var segmentRadius = Mathf.Cos(segmentDegree * Mathf.Deg2Rad); // [0 .. 0.707 .. 1 .. 0.707 .. 0]
for (int h = 0; h < sides; h++, vertexIndex++)
{
vertices[vertexIndex].x = vertices[h + unitCircleOffset].x * segmentRadius;
vertices[vertexIndex].y = segmentHeight;
vertices[vertexIndex].z = vertices[h + unitCircleOffset].z * segmentRadius;
}
}
vertexIndex = bottomVertexOffset;
{
for (int h = 0; h < sides; h++, vertexIndex++)
{
vertices[vertexIndex] = new Vector3(vertices[h + unitCircleOffset].x,
bottomOffset,
vertices[h + unitCircleOffset].z);
}
}
for (int v = 1; v < bottomRings; v++)
{
var segmentFactor = ((v - (bottomRings * 0.5f)) / bottomRings) + 0.5f; // [0.0f ... 1.0f]
var segmentDegree = (segmentFactor * 90); // [0 .. 90]
var segmentHeight = bottomOffset - bottomHeight +
((1 - Mathf.Sin(segmentDegree * Mathf.Deg2Rad)) *
bottomHeight);
var segmentRadius = Mathf.Cos(segmentDegree * Mathf.Deg2Rad); // [0 .. 0.707 .. 1 .. 0.707 .. 0]
for (int h = 0; h < sides; h++, vertexIndex++)
{
vertices[vertexIndex].x = vertices[h + unitCircleOffset].x * segmentRadius;
vertices[vertexIndex].y = segmentHeight;
vertices[vertexIndex].z = vertices[h + unitCircleOffset].z * segmentRadius;
}
}
{
for (int h = 0; h < sides; h++, vertexIndex++)
{
vertices[h + unitCircleOffset].y = topOffset;
}
}
return(true);
}
protected override void OnValidateInternal()
{
definition.Validate(); base.OnValidateInternal();
}