标签：Unity3d dNext devide startIndex 空心 Add iNext 圆柱体 triangles
代码创建空心圆柱体
public GameObject CreateHollowClinder(Vector3 ptStart, Vector3 ptEnd, float innerRadius, float outterRadius)
{
//计算垂直于轴的起始向量
Vector3 vec1 = ptEnd - ptStart;
Vector3 vec2 = Vector3.up;
float a = Vector3.Angle(vec1, vec2);
if(Mathf.Approximately(a, 0.0f))
{
vec2 = Vector3.right;
}
Vector3 vecStart = Vector3.Cross(vec1, vec2);
//计算开始面内圆点、外圆点，结束面内圆点、外圆点
List<Vector3> pointsStartInner = new List<Vector3>();
List<Vector3> pointsStartOutter = new List<Vector3>();
List<Vector3> pointsEndtInner = new List<Vector3>();
List<Vector3> pointsEndOutter = new List<Vector3>();
GameObject objStartInner = GameObject.CreatePrimitive(PrimitiveType.Sphere);
GameObject objStartOutter = GameObject.CreatePrimitive(PrimitiveType.Sphere);
GameObject objEndInner = GameObject.CreatePrimitive(PrimitiveType.Sphere);
GameObject objEndOutter = GameObject.CreatePrimitive(PrimitiveType.Sphere);
objStartInner.transform.position = ptStart + innerRadius * vecStart.normalized;
objStartOutter.transform.position = ptStart + outterRadius * vecStart.normalized;
objEndInner.transform.position = ptEnd + innerRadius * vecStart.normalized;
objEndOutter.transform.position = ptEnd + outterRadius * vecStart.normalized;
int devide = 30;//圆划分为多少等分
float angleStep = 360.0f / (float)devide;
float ang = 0.0f;
for (ang = 0.0f; ang < 360.0f; ang += angleStep)
{
objStartInner.transform.RotateAround(ptStart, vec1, angleStep);
objStartOutter.transform.RotateAround(ptStart, vec1, angleStep);
objEndInner.transform.RotateAround(ptEnd, vec1, angleStep);
objEndOutter.transform.RotateAround(ptEnd, vec1, angleStep);
pointsStartInner.Add(objStartInner.transform.position);
pointsStartOutter.Add(objStartOutter.transform.position);
pointsEndtInner.Add(objEndInner.transform.position);
pointsEndOutter.Add(objEndOutter.transform.position);
}
Destroy(objStartInner);
Destroy(objStartOutter);
Destroy(objEndInner);
Destroy(objEndOutter);
//构建曲面
List<Vector3> vertexs = new List<Vector3>();
vertexs.AddRange(pointsStartInner);//开始面内圆点
vertexs.AddRange(pointsEndtInner); //结束面内圆点
vertexs.AddRange(pointsStartOutter);//开始面外圆点
vertexs.AddRange(pointsEndOutter);////结束面外圆点
List<int> triangles = new List<int>();
//构建内表面
int startIndex = 0 * devide;
int EndIndex = 0 * devide + devide;
for (int i = startIndex; i < EndIndex; i++)
{
//边界面处
int iNext = i + 1;
int dNext = i + devide + 1;
if (iNext >= startIndex + devide)
iNext = startIndex;
if (dNext >= startIndex + 2 * devide)
dNext = startIndex + devide;
triangles.Add(i);
triangles.Add(i + devide);
triangles.Add(iNext);
triangles.Add(iNext);
triangles.Add(i + devide);
triangles.Add(dNext);
}
//构建外表面
startIndex = 2 * devide;
EndIndex = 2 * devide + devide;
for (int i = startIndex; i < EndIndex; i++)
{
//边界面处
int iNext = i + 1;
int dNext = i + devide + 1;
if (iNext >= startIndex + devide)
iNext = startIndex;
if (dNext >= startIndex + 2 * devide)
dNext = startIndex + devide;
triangles.Add(i);
triangles.Add(iNext);
triangles.Add(i + devide);
triangles.Add(iNext);
triangles.Add(dNext);
triangles.Add(i + devide);
}
//构建上表面
startIndex = 0 * devide;
EndIndex = 0 * devide + devide;
for (int i = startIndex; i < EndIndex; i++)
{
//边界面处
int iNext = i + 1;
int dNext = i + 2 * devide + 1;
if (iNext >= startIndex + devide)
iNext = startIndex;
if (dNext >= startIndex + 3 * devide)
dNext = startIndex + 2 * devide;
triangles.Add(i);
triangles.Add(iNext);
triangles.Add(i + 2 * devide);
triangles.Add(iNext);
triangles.Add(dNext);
triangles.Add(i + 2 * devide);
}
//构建下表面
startIndex = 1 * devide;
EndIndex = 1 * devide + devide;
for (int i = startIndex; i < EndIndex; i++)
{
//边界面处
int iNext = i + 1;
int dNext = i + 2 * devide + 1;
if (iNext >= startIndex + devide)
iNext = startIndex;
if (dNext >= startIndex + 3 * devide)
dNext = startIndex + 2 * devide;
triangles.Add(i);
triangles.Add(i + 2 * devide);
triangles.Add(iNext);
triangles.Add(iNext);
triangles.Add(i + 2 * devide);
triangles.Add(dNext);
}
Mesh chunkMesh = new Mesh();
chunkMesh.vertices = vertexs.ToArray();
chunkMesh.triangles = triangles.ToArray();
chunkMesh.RecalculateNormals();
chunkMesh.RecalculateBounds();
GameObject obj = new GameObject("MyClinder");
MeshFilter mf = obj.AddComponent<MeshFilter>();
MeshRenderer mr = obj.AddComponent<MeshRenderer>();
mr.material = Resources.Load<Material>("mat");
mf.sharedMesh = chunkMesh;
return obj;
}
标签：Unity3d,dNext,devide,startIndex,空心,Add,iNext,圆柱体,triangles 来源： https://blog.csdn.net/zouxin_88/article/details/88779099
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