/// <summary>
/// Builds the stem.
/// </summary>
/// <param name="meshBuilder">The mesh builder currently being added to.</param>
/// <param name="currentOffset">Vector3 to store the position at the end of the stem.</param>
/// <param name="currentRotation">Quaternion to store the rotation at the end of the stem.</param>
/// <param name="partData">The parameters describing the cylinder to be built.</param>
private void BuildStem(MeshBuilder meshBuilder, out Vector3 currentOffset, out Quaternion currentRotation, CylinderData partData)
{
currentOffset = Vector3.zero;
currentRotation = Quaternion.identity;
//bail if this part has been disabled:
if (!partData.m_Build)
{
return;
}
//build a straight stem if partData.m_BendAngle is zero:
if (partData.m_BendAngle == 0.0f)
{
//straight cylinder:
float heightInc = partData.m_Height / partData.m_HeightSegmentCount;
for (int i = 0; i <= partData.m_HeightSegmentCount; i++)
{
currentOffset = Vector3.up * heightInc * i;
BuildRing(meshBuilder, partData.m_RadialSegmentCount, currentOffset, partData.m_Radius, (float)i / partData.m_HeightSegmentCount, i > 0);
}
}
else
{
//get the bend angle in radians:
float stemBendRadians = partData.m_BendAngle * Mathf.Deg2Rad;
//the radius of our bend (vertical) circle:
float stemBendRadius = partData.m_Height / stemBendRadians;
//the angle increment per height segment (based on arc length):
float angleInc = stemBendRadians / partData.m_HeightSegmentCount;
//calculate a start offset that will place the centre of the first ring (angle 0.0f) on the mesh origin:
//(x = cos(0.0f) * stemBendRadius, y = sin(0.0f) * stemBendRadius)
Vector3 startOffset = new Vector3(stemBendRadius, 0.0f, 0.0f);
//build the rings:
for (int i = 0; i <= partData.m_HeightSegmentCount; i++)
{
//current normalised height value:
float heightNormalised = (float)i / partData.m_HeightSegmentCount;
//unit position along the edge of the vertical circle:
currentOffset = Vector3.zero;
currentOffset.x = Mathf.Cos(angleInc * i);
currentOffset.y = Mathf.Sin(angleInc * i);
//rotation at that position on the circle:
float zAngleDegrees = angleInc * i * Mathf.Rad2Deg;
currentRotation = Quaternion.Euler(0.0f, 0.0f, zAngleDegrees);
//multiply the unit postion by the bend radius:
currentOffset *= stemBendRadius;
//offset the position so that the base ring (at angle zero) centres around zero:
currentOffset -= startOffset;
//build the ring:
BuildRing(meshBuilder, partData.m_RadialSegmentCount, currentOffset, partData.m_Radius, heightNormalised, i > 0, currentRotation);
}
}
}
/// <summary>
/// Builds the stem.
/// </summary>
/// <param name="meshBuilder">The mesh builder currently being added to.</param>
/// <param name="currentOffset">Vector3 to store the position at the end of the stem.</param>
/// <param name="currentRotation">Quaternion to store the rotation at the end of the stem.</param>
/// <param name="partData">The parameters describing the cylinder to be built.</param>
private void BuildStem(MeshBuilder meshBuilder, out Vector3 currentOffset, out Quaternion currentRotation, CylinderData partData)
{
currentOffset = Vector3.zero;
currentRotation = Quaternion.identity;
//bail if this part has been disabled:
if (!partData.m_Build)
return;
//build a straight stem if partData.m_BendAngle is zero:
if (partData.m_BendAngle == 0.0f)
{
//straight cylinder:
float heightInc = partData.m_Height / partData.m_HeightSegmentCount;
for (int i = 0; i <= partData.m_HeightSegmentCount; i++)
{
currentOffset = Vector3.up * heightInc * i;
BuildRing(meshBuilder, partData.m_RadialSegmentCount, currentOffset, partData.m_Radius, (float)i / partData.m_HeightSegmentCount, i > 0);
}
}
else
{
//get the bend angle in radians:
float stemBendRadians = partData.m_BendAngle * Mathf.Deg2Rad;
//the radius of our bend (vertical) circle:
float stemBendRadius = partData.m_Height / stemBendRadians;
//the angle increment per height segment (based on arc length):
float angleInc = stemBendRadians / partData.m_HeightSegmentCount;
//calculate a start offset that will place the centre of the first ring (angle 0.0f) on the mesh origin:
//(x = cos(0.0f) * stemBendRadius, y = sin(0.0f) * stemBendRadius)
Vector3 startOffset = new Vector3(stemBendRadius, 0.0f, 0.0f);
//build the rings:
for (int i = 0; i <= partData.m_HeightSegmentCount; i++)
{
//current normalised height value:
float heightNormalised = (float)i / partData.m_HeightSegmentCount;
//unit position along the edge of the vertical circle:
currentOffset = Vector3.zero;
currentOffset.x = Mathf.Cos(angleInc * i);
currentOffset.y = Mathf.Sin(angleInc * i);
//rotation at that position on the circle:
float zAngleDegrees = angleInc * i * Mathf.Rad2Deg;
currentRotation = Quaternion.Euler(0.0f, 0.0f, zAngleDegrees);
//multiply the unit postion by the bend radius:
currentOffset *= stemBendRadius;
//offset the position so that the base ring (at angle zero) centres around zero:
currentOffset -= startOffset;
//build the ring:
BuildRing(meshBuilder, partData.m_RadialSegmentCount, currentOffset, partData.m_Radius, heightNormalised, i > 0, currentRotation);
}
}
}
public MCylinder(ushort id, CylinderData data)
{
ID = id;
CylData = data;
}
