public bool trace_triangle(ref Vector3 v0,
ref Vector3 v1, ref Vector3 v2, ref Vector3 src,
ref Vector3 dir, ref DxTraceInfo result, ref bool hitted)
{
float t = 0;
float u = 0;
float v = 0;
// 射线与三角形相交
if (VisUtil_IntersectTri(ref v0, ref v1, ref v2, ref src, ref dir, ref u, ref v, ref t))
{
if ((t >= 0.0f) && (t <= 1.0f))
{
if (result.nHitMax > 1)
{
if (result.nHitCount >= result.nHitMax)
{
return(false);
}
hitted = true;
if (t < result.fDistance)
{
// 距离最近的碰撞点
result.fDistance = t;
}
DxTraceInfo.hit_t pHit = result.Hits[result.nHitCount];
pHit.fDistance = t;
pHit.fTraceU = u;
pHit.fTraceV = v;
// 设置为地形对象
pHit.TraceID = new PERSISTID(0);
pHit.nMaterialIndex = 0;
pHit.Vertex[0] = v0;
pHit.Vertex[1] = v1;
pHit.Vertex[2] = v2;
pHit.strTexName = "";
if (++result.nHitCount >= result.nHitMax)
{
return(false);
}
}
else if (t < result.fDistance)
{
hitted = true;
// 距离最近的碰撞点
result.fDistance = t;
DxTraceInfo.hit_t pHit = result.Hits[0];
pHit.fDistance = t;
pHit.fTraceU = u;
pHit.fTraceV = v;
// 设置为地形对象
pHit.TraceID = new PERSISTID(0);
pHit.nMaterialIndex = 0;
pHit.Vertex[0] = v0;
pHit.Vertex[1] = v1;
pHit.Vertex[2] = v2;
pHit.strTexName = "";
result.nHitCount = 1;
}
}
}
return(true);
}
// 碰撞测试详细信息实现
public bool TraceDetail(ref D3DXVECTOR3 src, ref D3DXVECTOR3 dst, ref DxTraceInfo result)
{
Vector3 _src;
_src.x = src.x;
_src.y = src.y;
_src.z = src.z;
Vector3 _dst;
_dst.x = dst.x;
_dst.y = dst.y;
_dst.z = dst.z;
float dis = Vector3.Distance(_src, _dst);
if (dis <= 0)
{
return(false);
}
RaycastHit[] hits = new RaycastHit[result.nHitMax];
if (!game_obj.TraceDetail(_src, _dst, ref hits, ref result.nHitCount))
{
return(false);
}
Vector3 origin = _dst - _src;
//RaycastHit 转换成 DxTraceInfo
result.fDistance = 1e8f;
for (int i = 0; i < result.nHitCount; ++i)
{
RaycastHit hit = hits[i];
result.Hits[i].fDistance = hit.distance / dis;
if (result.fDistance > result.Hits[i].fDistance)
{
result.fDistance = result.Hits[i].fDistance;
}
if ((hit.collider && hit.collider.gameObject) && (Terrain.activeTerrain.gameObject == hit.collider.gameObject))
{
result.Hits[i].TraceID = new PERSISTID(0);
}
else
{
result.Hits[i].TraceID = new PERSISTID(1);
}
result.Hits[i].nMaterialIndex = 0;
result.Hits[i].strTexName = "";
if (hit.normal.y != 0.0f)
{
Vector3 p = hit.point + hit.normal;
float y = (Vector3.Dot(hit.normal, hit.point) - hit.normal.x * p.x - hit.normal.z * p.z) / hit.normal.y;
Vector3 p1 = new Vector3(p.x, y, p.z);
Vector3 n = Vector3.Cross(hit.normal, p1);
Vector3 p2 = n + hit.point;
result.Hits[i].Vertex[0] = hit.point;
result.Hits[i].Vertex[1] = p1;
result.Hits[i].Vertex[2] = p2;
result.Hits[i].fTraceU = 0.0f;
result.Hits[i].fTraceV = 0.0f;
continue;
}
if (hit.normal.x != 0.0f)
{
Vector3 p = hit.point + hit.normal;
float x = (Vector3.Dot(hit.normal, hit.point) - hit.normal.y * p.y - hit.normal.z * p.z) / hit.normal.x;
Vector3 p1 = new Vector3(x, p.y, p.z);
Vector3 n = Vector3.Cross(hit.normal, p1);
Vector3 p2 = n + hit.point;
result.Hits[i].Vertex[0] = hit.point;
result.Hits[i].Vertex[1] = p1;
result.Hits[i].Vertex[2] = p2;
result.Hits[i].fTraceU = 0.0f;
result.Hits[i].fTraceV = 0.0f;
continue;
}
if (hit.normal.z != 0.0f)
{
Vector3 p = hit.point + hit.normal;
float z = (Vector3.Dot(hit.normal, hit.point) - hit.normal.x * p.x - hit.normal.y * p.y) / hit.normal.z;
Vector3 p1 = new Vector3(p.x, p.y, z);
Vector3 n = Vector3.Cross(hit.normal, p1);
Vector3 p2 = n + hit.point;
result.Hits[i].Vertex[0] = hit.point;
result.Hits[i].Vertex[1] = p1;
result.Hits[i].Vertex[2] = p2;
result.Hits[i].fTraceU = 0.0f;
result.Hits[i].fTraceV = 0.0f;
continue;
}
}
return(true);
}
