public OrbitPoint At(float t)
{
KeyValuePair <float, OrbitPoint> prev = points.First();
if (t <= prev.Key)
{
return(prev.Value);
}
foreach (var next in points)
{
if (next.Key == t)
{
return(next.Value);
}
if (next.Key > t)
{
float length = next.Key - prev.Key;
float magnitude = (float)System.Math.Abs(length);
float u = 0.5f;
if (magnitude > 0.0001f)
{
float offset = t - prev.Key;
u = offset / length;
}
return(OrbitPoint.Mix(prev.Value, next.Value, u));
}
prev = next;
}
return(prev.Value);
}
public static OrbitPoint Mix(OrbitPoint a, OrbitPoint b, float t)
{
return(new OrbitPoint(
t * (b.Theta - a.Theta) + a.Theta,
t * (b.Phi - a.Phi) + a.Phi,
t * (b.Distance - a.Distance) + a.Distance
));
}
public void Update(float t)
{
OrbitPoint point = At(t);
Vector3 newPosition = point.Cartesian();
lookAt.SetLookAt(newPosition, Vector3.Zero, Vector3.UnitY);
frame.LocalToParent.Set(lookAt);
}
public void DemoRender()
{
float t = Time.Now;
if (t > LastDemoTime)
{
DemoStart();
t = 0.0f;
}
float e = exposure.At(t);
(Renderer.GlobalParameters.Values["exposure"] as IParameterValue <Floats>).Value.Set(e);
OrbitPoint o = cameraPath.At(t);
AverageCpuUsage += CPUUsage;
++updateCounter;
if (updateCounter == 10)
{
int cpu = (int)(AverageCpuUsage / updateCounter);
int megabytesInUse = (int)(MemoryUsage / (1024.0f * 1024.0f));
base.Title =
t.ToString("00.0")
+ " t = " + o.Theta.ToString("0.00")
+ " p = " + o.Phi.ToString("0.00")
+ " d = " + o.Distance.ToString("0.00")
+ " e = " + e.ToString("0.00")
+ " CPU Use " + cpu.ToString()
+ "% Mem Use " + megabytesInUse.ToString() + " MB"
+ " GC0 " + GC.CollectionCount(0)
+ " GC1 " + GC.CollectionCount(1)
+ " GC2 " + GC.CollectionCount(2)
+ " GC3 " + GC.CollectionCount(3)
;
AverageCpuUsage = 0.0f;
updateCounter = 0;
}
cameraPath.Update(t);
GL.ClearColor(0.1f, 0.2f, 0.5f, 0.0f);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
camera.Update(Renderer.CurrentViewport);
PartialGLStateResetToDefaults();
Renderer.CurrentCamera = camera;
Renderer.CurrentViewport = windowViewport;
Renderer.CurrentModel = model;
Renderer.CurrentMaterial = model.Material;
Renderer.CurrentProgram = Renderer.CurrentMaterial.Program;
Renderer.RenderCurrent();
SwapBuffers();
}