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Billboard Generation


Josh

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With the main culling and rendering algorithm done, I am focusing on the billboard display for the Leadwerks 3.7 vegetation system. My goal is to reduce the popping artifacts the Leadwerks 2 renderer displayed:

 

I am testing with a non-plant model with the idea that if I can get it to look reasonably well with an oddly sized mechanical object with highly visible lines, then a tree should look very good. Below you can see part of the billboard image drawn on the screen showing the object rendered from different angles.

 

blogentry-1-0-36480200-1444075774_thumb.jpg

 

The 3D model is being :"faded" in and out by discarding random pixels. I will attempt to fade the various billboard faces as well to make a smooth transition between viewing angles.

 

blogentry-1-0-19866900-1444075980.jpg

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Could something like this fade effect be used on model view ranges too? It could be nice to have especially for the far and medium view range settings.

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You could create a billboard studio tool that takes pictures at all the right angles. Seems like the bill boards would solve some of the lod needs

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I am now able to accurately generate billboards that blend perfectly with the 3D model from any angle. However, it it tricky to make a smooth transition between the different views. I tried rendering 26 different angles for every possible angle with a resolution of 45 degrees, but it needs more work.

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Josh, have a look ar this. I used it some years ago and it did exactly what you need. Models are prerendered as all around texture atlas on load. Works well with animated characters etc. Unfortunately it came along too late in the products life cycle and therefore got very little exposure. But there are some demos you can download and have a look at how they did the billboarding. http://www.thegamecreators.com/?m=view_product&id=2293

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That's impressive work, this could be used to render buildings or big structures in the far distance without having us to manually generate billboards as we would have checked some "Make billlboard" box.

 

Some distance parameter could be needed however to choose the distance of billboard if they are big or small objetcs ?

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