Hey, I've been busy implementing water effects into a terrain engine. The effect is based on moon-lab's pond demo. This is a link to the paper describing the effect.The included screenshots show a bug near the edges of the water. I checked the moon-lab's pond demo executable and the same kind of effect exists there however it is much smaller and therefore less noticeable. If it is necessary I'm happy to post any sourcecode regarding the water effect. p.s. The demo includes two wavemaps, I was wondering how they are created and whether there are any tools for this. I would like to create my own wavemaps because the included wavemaps had a low resolution. Thanks in advance, Quinnie [Edited by - Quinnie on January 1, 2008 6:55:56 PM]

Thanks a lot for your reply's,

My rendersurface for the refraction/reflection maps where set to 512x512 and my backbuffer was set to 1440x900. But I am not changing the aspect ratio while rendering the refraction/reflection maps. I did try changing the resolution of the refraction/reflection maps to 1440x900 but that didn't help.

I tried disabling the perturbation effect of the water, that seemed to fix the problem. Except that the water didn't look as good. So I'm guessing there is a problem with my perturbation calculations, I might be totally wrong though.

I'll post a snippit from my pixel shader:



This is a screanshot with perturbation disabled. There are still some artifacts near the edge of the water but it is much less.


Thanks a lot for your help so far,

Quinnie

First of all thanks a lot for your help,

I modified the shader using your proposed code. It has indeed improved the look of the water! However there are still some artifacts near the edge of the water. I'm guessing this is because the ripple offset moves the uv coordinates out of the texture, thus returning a black color. I tried clearing the render surfaces with a red color and the artifacts did indeed turn red.



Additionally the artifacts not only occur on the connection between the water and the terrain but also at the edges of the screen. This could also be explained because the uv coordinates exceed the reflection/refraction texture dimensions.

float vPerturbationMagnitude = -pow(Input.vPositionCopy.y, 20.0f) + 1.0f;

This magnitude parameter is used to fade out the ripple effect when the uv coordinates are near the bottom edge of the screen. I admit it was a bit hacky, instead I changed the texture mode from wrap to clamp. This solved the artifact problem near the edge of the screan. However the artifacts near the edge with the terrain remain.

Any additional advice would be greatly appreciated,

Quinnie

Thanks for clarifying that,

I changed the render target clear color to something blue/gray-ish and increased the clipplane height for the terrain. I did notice some ghost reflections but the edge artifacts where gone and the final look is a lot better now!

Thanks to all for your kind help!

Quinnie