Wednesday, August 28, 2013

Film grain and random light intensity

Randomizing light intensity for each pixel creates some sort of film grain effect that can look cool in some cases. Ray-tracing has this weakness of creating images that so "perfect" that they do not real. Path tracing is amazing but very expensive. I thought that using this randomization technique was pretty good, but it's for you to say if it really is ;-) Here are a few samples:

Sunday, August 18, 2013

Incredibly happy

Incredibly happy to have my CUDA molecule visualizer referenced on the nVidia website!!

First ever fully ray-traced photo visualizer for Oculus

Got a CUDA card? an Oculus Rift? a Kinect? Download the first ever immersive photo visualizer, fully ray-traced. Then drop a few jpg file in the photos subfolder and enjoy a unique experience!

Download link:

Sunday, August 4, 2013

Cuda, Kinect and Oculus rift, what a team!

I am finally getting to what I have been thinking about for the last few months, or maybe years: A fully ray-traced virtual and immersive environment. In order to achieve that project, the following technologies were able to fulfill my requirements:
  • Oculus rift for immersive 3D visualization and head orientation
  • Kinect for the position of the actor in the real 3D space
  • CUDA for making it possible to achieve real-time ray-tracing on a consumer PC.
  • WiiMotes for hands orientation and object manipulation
The application is written in C++ (No more than a few hundred lines of code), and is currently supported on Windows x64 platforms, mainly because of the Kinect device. A partial implementation also is available on Linux.

Download the Windows demo and judge by yourself :-)

Thursday, August 1, 2013

Interactive Ray-tracing and Oculus Rift

That's it, I found an Oculus rift in my mailbox 2 days ago and since then, my social life sort of isn't the same anymore ;-) After getting sick after an endless HL2 session, I decided that it was time to initiate more serious stuff. I you read my blog, you already know that I was really, really waiting for that rift, and despite the amazing weather outside, I spent another afternoon integrating that new device with my interactive CUDA raytracer. And here is the result:

Device initialization and  destruction was as simple as that:
void Scene::initializeOVR()
   HMDInfo Info;
   bool InfoLoaded;
      m_manager = *OVR::DeviceManager::Create();
   m_HMD = *m_manager->EnumerateDevices<HMDDevice>().CreateDevice();
   if (m_HMD)
      InfoLoaded = m_HMD->GetDeviceInfo(&Info);
      m_sensor = *m_HMD->GetSensor();
      m_sensor = *m_manager->EnumerateDevices<SensorDevice>().CreateDevice();

void Scene::finalizeOVR()

And getting the orientation of the drift is as difficult as that:
if ( m_sensorFusion.IsAttachedToSensor() )
  OVR::Quatf orientation = m_sensorFusion.GetOrientation(); 
  m_viewAngles.x = orientation.x;
  m_viewAngles.y = orientation.y;
  m_viewAngles.z = orientation.z;

m_gpuKernel->setCamera( m_viewPos, m_viewDir, m_viewAngles );

Splitting the screen for both eyes was already implemented in my engine, originaly for 3D vision, but I have to admin that Oculus is way more convincing.

More to come...