can we set alpha value on a texture with alpha ?

[jerome]

Hi,

 

Say I have a mesh with a material and this material is textured with an image.

I can obviously set the material.alpha property in order to make my mesh transparent.

mesh.material.alpha = 0.6;

Now, if the image used for the texture has an alpha channel and I want to apply it on the mesh, I can set it with : 

mesh.material.alpha = 1.0;mesh.material.diffuseTexture.hasAlpha = true;

This will let transparent all the parts of the image with related alpha values.

 

I'm just wondering if we could add/combine an extra alpha value to set the alpha of non-transparent parts of the image (as we do with material.alpha = val; ). Well, this would affect all the image pixels of course but the result would just be visible on parts non yet transparent.

[RaananW]

Works great. Load material "mat_784764" here - http://materialeditor.raananweber.com/.

Setting alpha makes the non-alpha parts of the texture be transparent.

[Temechon]

Hi Jerome,

 

With an opacity texture ? http://www.babylonjs-playground.com/#1MFDDU#2

[jerome]

I was not clear.

Here is your modified example : http://www.babylonjs-playground.com/#1MFDDU#3

 

Now I would like to give an alpha value to the tree leaves, make them slightly transparant

[RaananW]

like this? http://www.babylonjs-playground.com/#1MFDDU#4

[jerome]

thank you !

seems to work as I can see the box through the leaves : http://www.babylonjs-playground.com/#1MFDDU#5

 

but can we set this alpha value then ?

 

[EDIT] spoke too fast : material.alpha does the job 

http://www.babylonjs-playground.com/#1MFDDU#6

 

Thaannnnks you both guys 

[jerome]

what exactly does the getAlphaFromRGB from a png image ?

I just can't see the difference with or without it ...

[GameMonetize]

This parameter is only used for OpacityTexture where alpha could come either from Alpha channel or from luminance computed from RGB

[jerome]

oki doki

so mesh.diffuseTexture.getAlphaFromRGB is a non-sense

[GameMonetize]

At least it has no effect