CrossProcessing shader

Hi ! I’m doing a lot of image processing at work since a few weeks, and there a lots of things I wanna try, from post processes to dynamic geometry, but I would need another life for that. After having watched some (really nice) super cars videos (just check at the first one showing the Corvette to see what I mean), I’ve been talking with Nico about the Cross Processing effect, also called xpro, used in photography, and probably in the Corvette video.

After a quick talk (thanks) I made a simple pixel shader that post process a given scene with this nice effect 🙂

I followed this Photoshop tutorial to make it, here are the steps to work with the shader:

• Make a black-to-white gradient
• Add a New fill or adjustment layer, select Curves, and set the curves just like in the tutorial

• Save the 1D image, it’ll be used in the pixel shader just like a curve modifier
• Modify the final color of your pixels with this (GLSL) code:

vec3 curvesColor;

curvesColor.r = texture1D(curveTex, pixelColor.r ).r;
curvesColor.g = texture1D(curveTex, pixelColor.g).g;
curvesColor.b = texture1D(curveTex, pixelColor.b).b;

gl_FragColor.rgb = curvesColor;

And voila ! Here are some screenshots I took in Reverse (my end of studies project [team of 6 students]), maybe not the best example for this kind of effect but anyway:

Without

Without

With

With

With

With

In fact it makes me think about color temperature again, but this time the color is modifyed per channel and is dependent to the color components themselves instead of the luminance component of the pixel.

One more screen with all the effects combined during turbo (dolly zoom, desaturation, radial motion blur):

With

Well, I guess these are the first public screenshots of the final version of the game 🙂

Oh and by the way …

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Barcelona D-1

Hi! I’ve been quite silent since I got back from the SF’s GDC, so here are some news.

I’ll be flying to Barcelona, Spain tomorrow for a few days trip for Ubisoft where I’ll meet the team responsible for a new project. I really can’t say more about it because the game hasn’t be announced yet. The goal is to learn from a specific technology they’re developing over there which is very exiting (couldn’t tease more I guess), help them on their new game, and see how it could be used in other upcoming projects.

I’ve already done this kind of mission before for another technology made by the Montpellier team, a bit the same genre and older, but still confidential. So I’m glad to renew the experience with another studio, that I don’t know yet. Actually I already worked with the Barcelona team on Driver Parallel Lines for Wii last year, on the Wii-specific controls for the character/camera and vehicle, so I know a few of them.

As usual, I didn’t pack my stuff yet, the last time I did the same for my travel to San Francisco and the result was that I couldn’t find my digital camera battery recharger:/

Beside that, I told you I was making a small game engine and tool on top of Ogre and wxWidgets… Well it only has a few days of work, so the editor has nothing fancy for now (I’m still discovering wxWidgets), but the engine starts to be interesting from a usage point of view. There’s nothing Next-Gen in it but with a bit of work it’s gonna be … “wait for it … LENGEN…”, no, just cool.

In fact, in my end of studies project, as soon as I wanted to make a test with Ogre (or with the physics engine) I added things in my current in-game gamestate or player or camera class, and everytime it was making the code uglier with lots of previous test in the usual Update() methods (I’m summarizing but you can imagine), because I had only ONE game, so with my new project, the goal is to be able to make a new ‘demo’ with a few clicks (like a game on itself). I’ll explain that idea next time (moreover the editor part of this process hasn’t been done yet). Anyway here is a screenshot of it :

It hasn’t any name yet, but I’m working on it 🙂 The only cool thing for now is that the wxAUI and wxPropertyGrid parts of wxWidgets produce controls that look like the .net ones (auto-hide, dockable, drag’n drop, properties, blabla…).