3DSMax LightMap generation for Babylon

[pco38]

Hello,

Is somebody can explains me the setting I need to use (in 'Render to Texture' popup) to generate LightMaps with 3DSMax for Babylon.js?

I done a lot of test and the result when the model is exported for Babylon is a black screen...

Thanks for your help.

 

Regards

[V!nc3r]

In 3dsmax you just have to put your lightmap in the ambiant channel or lightmap channel (depends whats your want) of your (standard) material. You can use UV1 or UV2. Then, export to babylonjs, and it should be works.

As for the render to texture popup, settings depends only of your render engine. It only generates a texture map. I don't use the option which create shell material, maybe your issue come from here ?

[pco38]

It's exactly wath Idone, but It doesn't work with my model... Black screen in Babylon...

You can see the options I used in attached picture (sorry it's in French)

 

Thanks

[V!nc3r]

There is no reason that the issue comes from the RTT, this tool is just 3dsmax internal.

Is your scene works without lightmap ? Have you try to set a lightmap via javascript, just to test ?

Here an example if you want (here, the lightmap will use UV1 by default, but we don't care at this time) :

scene.getMeshByName("yourMeshName").material.ambientTexture = new BABYLON.Texture("yourLightmap.png", scene);

 

[pco38]

Yes my scene works fine without LightMap...

I tried to attach some lightmap manually in Javascript and it works fine...

[V!nc3r]

And with a default material assign to your object, configured like this ?

[GameMonetize]

can you share your scene? your .babylon file

[pco38]

Sorry I come back...

Find in attachment of this post the babylon file without LightMap that works fine

In the next post the model with LightMap that doesn't work

Model_without_LightMap_WORK.zip

[pco38]

the model with LightMap that doesn't work

It's strange because the size of the babylon file is smaller...

Model_with_LightMap_NOT_WORK.zip

[GameMonetize]

woot:) do you mind just exporting a plane, a light, a camera and your lighmap applied to the plane?

[pco38]

Yes of course ;-)

In attachment a Zip with 2 smalls models (the first on without LightMap and the second generated with lightMap) 

and the 2 3dsmax source files...

Thanks for your help

Model.zip

[GameMonetize]

I think there is something else: your testWithLightmap.babylon contains two meshes with 0 vertices

 

[V!nc3r]

• in the RTT, don't create shell material
• reassign the right material
• in this material, set the ambient color to whatever except black
• maybe set the scene ambient color too
• create a camera

and it should works :

 

[pco38]

Thank you V!nc3r for your.

I followed your instrutions and now it works fine.

Thank you very much