void UnderWaterGodRay::_updateRays()
{
Camera * cam = World::Instance()->MainCamera();
const Vec3 * corner = cam->GetCorner();
float FarWidth = (corner[4] - corner[5]).Length();
float RaysLength = cam->GetFarClip();
VertexBufferPtr vb = mRender.vxStream.GetStream(0);
Vec3 * vert = (Vec3*)vb->Lock(0, 0, LOCK_DISCARD);
Vec2 Pos;
float Dis, RayLength;
for(int k = 0; k < mNumberOfRays; k++)
{
Pos = _calculateRayPosition(k);
Dis = mRaysSize * RaysLength;
RayLength = RaysLength * (0.3f + Pos.Length());
Pos *= FarWidth/2;
// 4 Planes, 3 vertices each plane, 12 vertices per ray
// ----> 1/4
// 0
*vert++ = Vec3(0, 0, 0);
// A
*vert++ = Vec3(Pos.x, Pos.y, -RayLength);
// B
*vert++ = Vec3(Pos.x+Dis, Pos.y, -RayLength);
// ----> 2/4
// 0
*vert++ = Vec3(0, 0, 0);
// D
*vert++ = Vec3(Pos.x+Dis, Pos.y+Dis, -RayLength);
// B
*vert++ = Vec3(Pos.x+Dis, Pos.y, -RayLength);
// ----> 3/4
// 0
*vert++ = Vec3(0, 0, 0);
// C
*vert++ = Vec3(Pos.x, Pos.y+Dis, -RayLength);
// D
*vert++ = Vec3(Pos.x+Dis, Pos.y+Dis, -RayLength);
// ----> 4/4
// 0
*vert++ = Vec3(0, 0, 0);
// C
*vert++ = Vec3(Pos.x, Pos.y+Dis, -RayLength);
// A
*vert++ = Vec3(Pos.x, Pos.y, -RayLength);
}
vb->Unlock();
}
void GodRaysManager::_updateRays()
{
// Get frustum corners to calculate far plane dimensions
const Ogre::Vector3 *FrustumCorners = mProjectorCamera->getWorldSpaceCorners();
// Calcule far plane dimensions
float FarWidth = (FrustumCorners[4] - FrustumCorners[5]).length();
Ogre::Real RaysLength = mProjectorCamera->getFarClipDistance();
mManualGodRays->beginUpdate(0);
Ogre::Vector2 Pos;
Ogre::Real Dis, RayLength;
// Rays are modeled as piramids, 12 vertex each ray
//
// // 0\\
// /| | |
// || | |
// || | | (0,0) (1,0)
// || | | A B
// || | |
// |A----|-|B (0,1) (1,1)
// |/ |/ C D
// C------D
for(int k = 0; k < mNumberOfRays; k++)
{
Pos = _calculateRayPosition(k);
Dis = mRaysSize*RaysLength;
RayLength = RaysLength*(0.95+Pos.length());
Pos *= FarWidth/2;
// 4 Planes, 3 vertices each plane, 12 vertices per ray
// ----> 1/4
// 0
mManualGodRays->position(0, 0, 0);
// A
mManualGodRays->position(Pos.x, Pos.y, -RayLength);
// B
mManualGodRays->position(Pos.x+Dis, Pos.y, -RayLength);
// ----> 2/4
// 0
mManualGodRays->position(0, 0, 0);
// D
mManualGodRays->position(Pos.x+Dis, Pos.y+Dis, -RayLength);
// B
mManualGodRays->position(Pos.x+Dis, Pos.y, -RayLength);
// ----> 3/4
// 0
mManualGodRays->position(0, 0, 0);
// C
mManualGodRays->position(Pos.x, Pos.y+Dis, -RayLength);
// D
mManualGodRays->position(Pos.x+Dis, Pos.y+Dis, -RayLength);
// ----> 4/4
// 0
mManualGodRays->position(0, 0, 0);
// C
mManualGodRays->position(Pos.x, Pos.y+Dis, -RayLength);
// A
mManualGodRays->position(Pos.x, Pos.y, -RayLength);
}
mManualGodRays->end();
}
