Method value

Engine/source/T3D/cameraSpline.cpp:292–395

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//-----------------------------------------------------------------------------
void CameraSpline::value(F32 t, CameraSpline::Knot *result, bool skip_rotation)
{
   // Do some easing in and out for t.
   if(!gBuilding)
   {
      F32 oldT = t;
      if(oldT < 0.5f)
      {
         t = 0.5f - (mSin( (0.5 - oldT) * M_PI ) / 2.f);
      }

      if((F32(size()) - 1.5f) > 0.f && oldT - (F32(size()) - 1.5f) > 0.f)
      {
         oldT -= (F32(size()) - 1.5f);
         t = (F32(size()) - 1.5f) + (mCos( (0.5f - oldT) * F32(M_PI) ) / 2.f);
      }
   }

   // Verify that t is in range [0 >= t > size]
//   AssertFatal(t >= 0.0f && t < (F32)size(), "t out of range");
   Knot *p1 = getKnot((S32)mFloor(t));
   Knot *p2 = next(p1);

   F32 i = t - mFloor(t);  // adjust t to 0 to 1 on p1-p2 interval

   if (p1->mPath == Knot::SPLINE)
   {
      Knot *p0 = (p1->mType == Knot::KINK) ? p1 : prev(p1);
      Knot *p3 = (p2->mType == Knot::KINK) ? p2 : next(p2);
      result->mPosition.x = mCatmullrom(i, p0->mPosition.x, p1->mPosition.x, p2->mPosition.x, p3->mPosition.x);
      result->mPosition.y = mCatmullrom(i, p0->mPosition.y, p1->mPosition.y, p2->mPosition.y, p3->mPosition.y);
      result->mPosition.z = mCatmullrom(i, p0->mPosition.z, p1->mPosition.z, p2->mPosition.z, p3->mPosition.z);
   }
   else
   {   // Linear
      result->mPosition.interpolate(p1->mPosition, p2->mPosition, i);
   }

   if (skip_rotation)
      return;

   buildTimeMap();

   // find the two knots to interpolate rotation and velocity through since some
   // knots are only positional
   S32 start = (S32)mFloor(t);
   S32 end   = (p2 == p1) ? start : (start + 1);
   while (p1->mType == Knot::POSITION_ONLY && p1 != front())
   {
      p1 = prev(p1);
      start--;
   }

   while (p2->mType == Knot::POSITION_ONLY && p2 != back())
   {
      p2 = next(p2);
      end++;
   }