// generate rays
public H1Ray[] GenerateRays()
{
List <H1Ray> Rays = new List <H1Ray>();
H1Vector3 CameraLocation = Position;
Int32 ResolutionX = Convert.ToInt32(ViewFrustum.Viewport.ResolutionX);
Int32 ResolutionY = Convert.ToInt32(ViewFrustum.Viewport.ResolutionY);
Int32 IndexLT = Convert.ToInt32(H1ViewFrustum.EFrustumVerticeIndex.NEAR_0);
H1Vector3 WorldScreenLT = H1Vector3.Transform(ViewFrustum.LocalFrustumVertices[IndexLT + 0], ViewMatrix);
H1Vector3 WorldScreenLB = H1Vector3.Transform(ViewFrustum.LocalFrustumVertices[IndexLT + 1], ViewMatrix);
H1Vector3 WorldScreenRB = H1Vector3.Transform(ViewFrustum.LocalFrustumVertices[IndexLT + 2], ViewMatrix);
H1Vector3 WorldScreenRT = H1Vector3.Transform(ViewFrustum.LocalFrustumVertices[IndexLT + 3], ViewMatrix);
H1Vector3 OffsetX = (WorldScreenRT - WorldScreenLT) / ResolutionX;
H1Vector3 OffsetY = (WorldScreenLB - WorldScreenLT) / ResolutionY;
for (Int32 PixelY = 0; PixelY < ResolutionY; ++PixelY)
{
for (Int32 PixelX = 0; PixelX < ResolutionX; ++PixelX)
{
H1Vector3 Offset = WorldScreenLT + OffsetX * PixelX + OffsetY * PixelY;
H1Ray NewRay = new H1Ray();
NewRay.Origin = CameraLocation;
NewRay.Direction = H1Vector3.Normalize(Offset - NewRay.Origin);
Rays.Add(NewRay);
}
}
return(Rays.ToArray());
}
public bool SetViewFrustum(float InNearDist, float InFarDist, float InFov, float InScreenResolutionX, float InScreenResolutionY)
{
float ScreenRatio = InScreenResolutionX / InScreenResolutionY;
if (ViewFrustum == null)
{
ViewFrustum = new H1ViewFrustum();
}
ViewFrustum.Fov = InFov;
ViewFrustum.ScreenRatio = ScreenRatio;
ViewFrustum.NearDistance = InNearDist;
ViewFrustum.FarDistance = InFarDist;
ViewFrustum.Viewport.ResolutionX = InScreenResolutionX;
ViewFrustum.Viewport.ResolutionY = InScreenResolutionY;
// generate view frustum vertices
H1Vector3 LookAt = new H1Vector3(0, 1, 0);
H1Vector3 LocalX = new H1Vector3(1, 0, 0);
H1Vector3 LocalZ = new H1Vector3(0, 0, 1);
H1Vector3 NearPlanePosition = new H1Vector3(0, 0, 0) + ViewFrustum.NearDistance * LookAt;
float HalfHeightForNearPlane = ViewFrustum.NearDistance * (float)Math.Tan(ViewFrustum.Fov);
float HalfWidthForNearPlane = ViewFrustum.ScreenRatio * HalfHeightForNearPlane;
Int32 NearPlaneStartIndex = Convert.ToInt32(H1ViewFrustum.EFrustumVerticeIndex.NEAR_0);
ViewFrustum.LocalFrustumVertices[NearPlaneStartIndex + 0] = NearPlanePosition
+ HalfWidthForNearPlane * (-LocalX) + HalfHeightForNearPlane * (LocalZ);
ViewFrustum.LocalFrustumVertices[NearPlaneStartIndex + 1] = NearPlanePosition
+ HalfWidthForNearPlane * (-LocalX) + HalfHeightForNearPlane * (-LocalZ);
ViewFrustum.LocalFrustumVertices[NearPlaneStartIndex + 2] = NearPlanePosition
+ HalfWidthForNearPlane * (LocalX) + HalfHeightForNearPlane * (LocalZ);
ViewFrustum.LocalFrustumVertices[NearPlaneStartIndex + 3] = NearPlanePosition
+ HalfWidthForNearPlane * (LocalX) + HalfHeightForNearPlane * (LocalZ);
H1Vector3 FarPlanePosition = new H1Vector3(0, 0, 0) + ViewFrustum.FarDistance * LookAt;
float HalfHeightForFarPlane = ViewFrustum.FarDistance * (float)Math.Tan(ViewFrustum.Fov);
float HalfWidthForFarPlane = ViewFrustum.ScreenRatio * HalfHeightForFarPlane;
Int32 FarPlaneStartIndex = Convert.ToInt32(H1ViewFrustum.EFrustumVerticeIndex.FAR_0);
ViewFrustum.LocalFrustumVertices[FarPlaneStartIndex + 0] = FarPlanePosition
+ HalfWidthForFarPlane * (-LocalX) + HalfHeightForFarPlane * (LocalZ);
ViewFrustum.LocalFrustumVertices[FarPlaneStartIndex + 1] = FarPlanePosition
+ HalfWidthForFarPlane * (-LocalX) + HalfHeightForFarPlane * (-LocalZ);
ViewFrustum.LocalFrustumVertices[FarPlaneStartIndex + 2] = FarPlanePosition
+ HalfWidthForFarPlane * (LocalX) + HalfHeightForFarPlane * (LocalZ);
ViewFrustum.LocalFrustumVertices[FarPlaneStartIndex + 3] = FarPlanePosition
+ HalfWidthForFarPlane * (LocalX) + HalfHeightForFarPlane * (LocalZ);
return(true);
}
public bool Render()
{
H1Entity CameraObject = new H1Entity();
H1RayTracerCameraComponent RayTracerCameraComponent = new H1RayTracerCameraComponent(CameraObject);
Int32 ResolutionX = BackBuffer.Width;
Int32 ResolutionY = BackBuffer.Height;
H1Vector3 Direction = H1Vector3.Normalize(new H1Vector3(0, 1, -1));
RayTracerCameraComponent.UpdateCamera(new H1Vector3(0, 0, 500), Direction);
RayTracerCameraComponent.SetViewFrustum(100, 1000, (float)(30.0 / Math.PI), ResolutionX, ResolutionY);
// test ray tracer component entity
H1RayTracerComponent OneComponent = new H1RayTracerComponent(CameraObject);
OneComponent.Activate();
float Extent = 25.0f;
OneComponent.CreateBoxBound(new H1Vector3(0, 500, 0), new H1Vector3(Extent, Extent, Extent));
H1Ray Ray = new H1Ray(new H1Vector3(0, 0, 500), Direction);
float T0, T1;
bool bCollide = OneComponent.IsCollide(Ray, out T0, out T1);
H1Ray[] Rays = RayTracerCameraComponent.GenerateRays();
H1RayTracerSystem.Singleton.RayCast(Rays, ref BackBuffer);
Bitmap NewBitmap = new Bitmap(ResolutionX, ResolutionY);
for (Int32 PixelY = 0; PixelY < ResolutionY; ++PixelY)
{
for (Int32 PixelX = 0; PixelX < ResolutionX; ++PixelX)
{
H1Color PixelColor = BackBuffer[PixelX, PixelY];
Color OutColor = Color.FromArgb(PixelColor.A, PixelColor.R, PixelColor.G, PixelColor.B);
NewBitmap.SetPixel(PixelX, PixelY, OutColor);
}
}
NewBitmap.Save("RayTracerOutput.png", ImageFormat.Png);
return(true);
}
public void UpdateCamera(H1Vector3 InPosition, H1Vector3 InLookAt)
{
Position = InPosition;
LookAt = InLookAt;
// create camera matrix (view matrix)
H1Vector3 UpVector = new H1Vector3(0, 0, 1);
H1Vector3 RightVector = H1Vector3.Normalize(H1Vector3.Cross(LookAt, UpVector));
UpVector = H1Vector3.Normalize(H1Vector3.Cross(RightVector, LookAt));
ViewMatrix = new H1Matrix();
ViewMatrix.Look = LookAt;
ViewMatrix.Right = RightVector;
ViewMatrix.Up = UpVector;
ViewMatrix.TranslationVector = InPosition;
}
// @TODO - it just temporary, need to think where to move
public void CreateBoxBound(H1Vector3 InPosition, H1Vector3 InExtent)
{
Bound = new H1Bound(H1Bound.EBoundType.Box, InPosition, InExtent);
}
