//-----------------------------------------------------------------------------
// build a surface
void Wreck::buildSurface(
mgBezier& bodySpline,
double bodyScale,
int bodySteps,
mgBezier& lenSpline,
double lenScale,
int lenSteps,
const mgMatrix4& xform,
BOOL outwards,
int texture)
{
double bodyLen = bodySpline.getLength();
double lenLen = lenSpline.getLength();
mgVertexTA* points = new mgVertexTA[(bodySteps+1) * (lenSteps+1)];
mgPoint3 lenPt, bodyPt, xpt;
for (int i = 0; i <= lenSteps; i++)
{
lenSpline.splinePt((lenLen * i)/lenSteps, lenPt);
double ht = lenPt.y - lenPt.z;
for (int j = 0; j <= bodySteps; j++)
{
bodySpline.splinePt((bodyLen * j)/bodySteps, bodyPt);
mgVertexTA* v = &points[i*(bodySteps+1)+j];
mgPoint3 pt(lenScale * (ht * bodyScale * bodyPt.x),
lenScale * (lenPt.z + ht * bodyScale * bodyPt.y),
lenScale * lenPt.x);
xform.mapPt(pt, xpt);
v->setPoint(xpt.x, xpt.y, xpt.z);
v->setTexture(2*j/(double) bodySteps, 2*i/(double) lenSteps, texture);
}
}
// set all the normals
setNormals(points, lenSteps+1, bodySteps+1, outwards);
int vertexBase = m_vertexes->getLength();
for (int i = 0; i < (lenSteps+1)*(bodySteps+1); i++)
m_vertexes->addVertex(&points[i]);
m_indexes->addGrid(vertexBase, bodySteps+1, lenSteps, bodySteps, outwards);
delete points;
}
//-----------------------------------------------------------------------------
// find x value on spline
double Tower::findSplineX(
mgBezier& spline,
double target,
int count,
double dist)
{
mgPoint3 pt;
double step = dist;
for (int i = 0; i < count; i++)
{
spline.splinePt(dist, pt);
if (pt.x > target)
dist -= step;
else if (pt.x < target)
dist += step;
else break; // if equal
step /= 2;
}
return dist;
}
