-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Maik Justus wrote: | Hi Stuart, | | Stuart Buchanan schrieb am 22.01.2008 23:04: |> Hi All, |> |> I've been working on a shader-based approach to creating random trees with help |> from Tim Moore. |> |> Here's a screenshot of what I've managed to achieve so far: |> |> http://www.nanjika.co.uk/flightgear/forest.jpg |> |> A patch which includes both the shader trees and improvements to the random |> object placement is available from |> |> http://www.nanjika.co.uk/flightgear/trees.tar.gz |> |> | very nice. Low-level-flying is much more interesting now. |> This isn't yet ready for inclusion in CVS, but worth having a play about with. |> |> | Why not? cvs is the place for developing. I am, of course, enormously proud of this work and hope to get it into CVS as soon as possible. That said, a feature with this list of issues:
|> Notes: |> - Currently all the trees of a given type on a tile will be the same size, shape |> and texture. |> - It's highly likely that this code leaks memory like a sieve. |> - The shader currently doesn't perform any diffuse lighting calculations. For |> some reason including the diffuse lighting causes a "flickering" effect, possibly |> due to the light source being so far away. |> and no way to disable it other than to turn off other features, isn't quite ready for CVS. If Stuart has run out of time, I'll bang on this and shoot for checking it in over the weekend. The flicker is caused by there being no normals in the tree "model." The calculations performed in the vertex and fragment shaders are a little mixed up. For now the diffuse lighting calculation should be done in the vertex shader, while the fog calculation should be done in the fragment shader. The shader program and tree texture should be shared between all the forests. Anyway, the results are beautiful. Last night I found myself watching Anders Gidenstam's live web feed of his airship voyages over the forests of South Germany as if it were a TV special! Tim -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iD8DBQFHl0YueDhWHdXrDRURAsdJAKDb1EhE61GKVZIHXuBiWCQRvOswxQCgu8Nx A4RTdmo645BbEx5OviUdZa4= =TjRc -----END PGP SIGNATURE----- ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
