private bool MoveToPlaneIfOnNegativeSide(ref Plane sidePlane, ref Vector3 p0)
{
float distance = sidePlane.Distance(p0);
if (distance >= 0)
{
return(false);
}
p0 -= sidePlane.normal * distance;
return(true);
}
public FrustumSphereMeshBuilder(Vector3 center, float radius, Camera cam, int triangleRatio)
{
this.center = center;
this.radius = radius;
triangles = new List <TriangleData>();
camPos = cam.transform;
Vector3[] corners = new Vector3[5];
cam.CalculateFrustumCorners(cam.rect,
cam.farClipPlane,
Camera.MonoOrStereoscopicEye.Mono,
corners);
Transform camTransform = cam.transform;
Vector3 camPosition = cam.transform.position;
//centerInter = new RaySphereIntersection(camPosition, center-camPosition, center, radius);
// compute world space coordinates for frustum
for (var index = 0; index < 4; index++)
{
corners[index] = camTransform.TransformPoint(corners[index]);
}
corners[4] = corners[0];
Vector3 p0 = camPosition;
Vector3 p1, p2;
plane = new Plane[5];
float distanceSqr = (p0 - center).sqrMagnitude;
if (distanceSqr > radius * radius)
{
plane[4] = Plane.SphereBackPlaneSeenFromPosition(p0, center, radius);
psi = new PlaneSphereIntersection(plane[4], center, radius);
seed = psi.ProjectOnCircle(camPosition);
for (int i = 0; i < 4; ++i)
{
p1 = corners[i];
p2 = corners[i + 1];
Plane p = new Plane(p0, p2, p1);
p.SetName(Vector3.Lerp(p1, p2, 0.5f), "SidePl" + i);
plane[i] = p;
MoveToPlaneIfOnNegativeSide(ref plane[i], ref seed);
}
}
else
{
return;
}
Vector3 axis = plane[4].normal;
Quaternion q = Quaternion.AngleAxis(120, axis);
Vector3 direction = Vector3.Cross(axis, camTransform.up).normalized;
direction *= radius / triangleRatio;
p0 = direction;
p1 = q * p0;
p2 = q * p1;
p0 += seed;
p1 += seed;
p2 += seed;
first = new TriangleData(new List <VerticeData>(), p0, p1, p2, "0", psi);
first[0].isVisible = first.IsVisible(first[0].pos, plane);
first[1].isVisible = first.IsVisible(first[1].pos, plane);
first[2].isVisible = first.IsVisible(first[2].pos, plane);
}
public void Compute()
{
main.CalculateFrustumCorners(main.rect,
main.farClipPlane,
Camera.MonoOrStereoscopicEye.Mono,
corners);
//centerInter = new RaySphereIntersection(camPosition, center-camPosition, center, radius);
// compute world space coordinates for frustum
for (var index = 0; index < 4; index++)
{
corners[index] = camTransform.TransformPoint(corners[index]);
}
corners[4] = corners[0];
Vector3 p0 = camPosition;
float distanceSqr = (p0 - center).sqrMagnitude;
if (distanceSqr > radius * radius)
{
backPlane = Plane.SphereBackPlaneSeenFromPosition(p0, center, radius);
backPlaneInter = new PlaneSphereIntersection(backPlane, center, radius);
seed = center;
for (int i = 0; i < 4; ++i)
{
Vector3 p1 = corners[i];
Vector3 p2 = corners[i + 1];
Plane p = new Plane(p0, p2, p1);
p.SetName(Vector3.Lerp(p1, p2, 0.5f), "SidePl" + i);
plane[i] = p;
planeInter[i] = new PlaneSphereIntersection(p, center, radius);
cornersInter[i] = new RaySphereIntersection(p0, p1 - p0, center, radius);
moved[i] = MoveToPlaneIfOnNegativeSide(ref plane[i], ref seed);
}
seedInter = new RaySphereIntersection(camPosition, seed - camPosition, center, radius);
ComputeAllSegments();
}
else
{
for (int i = 0; i < 4; ++i)
{
Vector3 p1 = corners[i];
Vector3 p2 = corners[i + 1];
Plane p = new Plane(p0, p1, p2);
p.SetName(Vector3.Lerp(p1, p2, 0.5f), "SidePl" + i);
plane[i] = p;
planeInter[i] = new PlaneSphereIntersection(p, center, radius);
cornersInter[i] = new RaySphereIntersection(p0, p1 - p0, center, radius);
}
allSegments.Clear();
for (int i = 0; i < 4; ++i)
{
Vector3 start = cornersInter[i].I;
Vector3 end = cornersInter.Modulo(i + 1).I;
SegmentBuilder builder = new SegmentBuilder(i, start, end);
builder.BuildSegment(this);
}
}
barycenter = Vector3.zero;
if (allSegments.Count > 0)
{
foreach (CircleSegment circleSegment in allSegments)
{
//for(float angle = 0; angle < circleSegment.angle; angle += 5)
{
barycenter += circleSegment.Start;
}
}
barycenter /= allSegments.Count;
barycenter = center + (barycenter - center).normalized * radius;
}
}