3ds lightmap issue

underfox

Hi everyone, I doing a scene and i was planning to create a ligthmap and use it to see it on 3ds viewport, the thing is the result is nothing cmpared to the rendered version and I don't know where is the problem.

Viewport version



Rendered Version:






Well as you can see the floor is not tiling and the lightning is completly diferente from the rendered version.

I'm not using any post process effect or anything like that, I am merlely using omnis spotlight and Mr omni.

I would greatly appreciate some enlightenment :poly124:

JamesWild

-How was the floor tiling done
-The bottom one looks gamma correct, while the top does not.

underfox

by using the tiling options in the material editor, but once i use the lightmap.fx i can't find any option that permit me to tile my textures.

Eric Chadwick

The fx shader needs to have the same tiling options as what you used in the Standard material. Since it doesn't, you'll need to reset the tiling in your material and re-do the tiling in a UV modifier instead, like UVW Xform or Unwrap UVW. Also, you'll need to bake the lightmap using a 2nd set of UVs (so it isn't tiled). Usually this is UV channel 2. Does the shader expect UV2?

Eric Chadwick

Ah, if you open up lightmap.fx in a text editor, you'll see it has this comment. So then you would need to create UV channel 4, and bake your lightmap using that channel.

//////////////////////////////////////////////////
//simple light map shader with blend amount
//It uses map channel 1 for the diffuse and map channel 4 for the light, and is designed for RTT usage.
//Complete over kill, but simple to write..
//////////////////////////////////////////////////

underfox

yes i do know that. The problem is , I can't find anywhere any option that permit me to tile my texture in the lighmap.fx rollout

as for the chanel I don't have any problem with that but thanks for the information anyway.

Eric Chadwick

Right, so don't tile in the fx shader, instead do the tiling in the UV channel.

underfox

Many thanks Eric, a simple solution that worked wonders.

the thing is i found a new problem :P when i render the scene, the lightmap doesn't show up ( therefor no shoadows), is there a way around that?

Eric Chadwick

FX shaders don't work with offline renderers (any of the stuff in the Rendering menu). If you want to "render" the viewport out to a file, open the Tools menu and choose one of the Grab Viewport methods.
http://docs.autodesk.com/3DSMAX/15/ENU/3ds-Max-Help/files/GUID-02B83BCD-6621-4F0F-878B-9781A07C996E.htm

underfox

ok, well perfect then, thanks for the info once again