void OculusWorldDemoApp::OnIdle()
{
double curtime = pPlatform->GetAppTime();
float dt = float(curtime - LastUpdate);
LastUpdate = curtime;
if (LoadingState == LoadingState_DoLoad)
{
LoadingState = LoadingState_Finished;
return;
}
// If one of Stereo setting adjustment keys is pressed, adjust related state.
if (pAdjustFunc)
{
(this->*pAdjustFunc)(dt * AdjustDirection * (ShiftDown ? 5.0f : 1.0f));
}
// Rotate and position View Camera, using YawPitchRoll in BodyFrame coordinates.
//
Matrix4f rollPitchYaw = Matrix4f::RotationY(0) * Matrix4f::RotationX(0) * Matrix4f::RotationZ(0); // YAW PITCH ROLL
const Vector3f UpVector(0.0f, 1.0f, 0.0f);
const Vector3f ForwardVector(0.0f, 0.0f, -1.0f);
Vector3f up = rollPitchYaw.Transform(UpVector);
Vector3f forward = rollPitchYaw.Transform(ForwardVector);
// Minimal head modeling; should be moved as an option to SensorFusion.
float headBaseToEyeHeight = 0.15f; // Vertical height of eye from base of head
float headBaseToEyeProtrusion = 0.09f; // Distance forward of eye from base of head
Vector3f eyeCenterInHeadFrame(0.0f, headBaseToEyeHeight, -headBaseToEyeProtrusion);
Vector3f shiftedEyePos = rollPitchYaw.Transform(eyeCenterInHeadFrame);
shiftedEyePos.y -= eyeCenterInHeadFrame.y; // Bring the head back down to original height
View = Matrix4f::LookAtRH(shiftedEyePos, shiftedEyePos + forward, up);
// Transformation without head modeling.
// View = Matrix4f::LookAtRH(EyePos, EyePos + forward, up);
// This is an alternative to LookAtRH:
// Here we transpose the rotation matrix to get its inverse.
// View = (Matrix4f::RotationY(EyeYaw) * Matrix4f::RotationX(EyePitch) *
// Matrix4f::RotationZ(EyeRoll)).Transposed() *
// Matrix4f::Translation(-EyePos);
//case Stereo_LeftDouble_Multipass:
Render(SConfig.GetEyeRenderParams(StereoEye_Left));
Render(SConfig.GetEyeRenderParams(StereoEye_Right));
pRender->Present();
// Force GPU to flush the scene, resulting in the lowest possible latency.
pRender->ForceFlushGPU();
}
