Transparency rendering

[vblack]

I'm trying to create a shader with transparency (like a glass). I set the Material in Alpha (I would expect more type like, choosing Dest and Src Blend), but I notice that the objects behind the transparent door are red, and sort is not correct.

How to achieve the correct effect ? Is that supported ? Also I need more mode like premultiplied alpha or additive etc..

 

_Glass.mat

diffuse+normal+alpha.shader

[Josh]

There is already a glass material provided.

See Materials\Effects\glass.mat

[vblack]

Yes I'm using it in fact (attached), but it doesn't do what I want. I have 'Diffuse' the texture with alpha, also I want to use the texture4 for using for reflection. Also the one used doesn't work with double sided.

I set

Blend-mode: Alpha
Two sided
Depth Test
Depth Mask (OFF), assuming the transparent are rendered after the opaque geometry.

Here the screenshot : The objet behind looks 'red'

[Josh]

The default glass material looks correct to me.  What are you changing that makes it behave like that?  You might have to write a new shader if you are doing something different from what the refraction glass material provides.

[vblack]

apparently the objects which have environment mapping are 'red' under transparency

Here better version :

[Josh]

Ah okay.  I will check this out in the morning.

[vblack]

Thanks, again, it affects mainly the object using environment mapping. It looks that the rendering is doing some multiple passes, and this transparent material is in the 'wrong' pass (should be rendered just before the post processing).

[Josh]

If you load this map you can see transparency working correctly with probes, with both a model and a brush painted with the glass material.

If you modified your glass material, you may need to restore it with the attached one.

If you still have problems please tell me your graphics card and operating system.

probes.map

glass.mat

[vblack]

Does the same. In fact, it works in editor mode, but when I switch to game mode, it get red.

I will ask our artist to prepare a project with the issue, it will be simpler (Tested on nVidia GT 770, does the same on GT 900).

EDIT: For me, it is a problem with deferred rendering engine and transparency, and what I'm seeing 'red' is one of the G Buffer, I know that transparency and deferred can be tricky something, maybe it is an edge case ?

[vblack]

Reopening this topic. The transparency works now on 4.4 version, however, light probes are not. If I disable the blending mode, it works, else, I lose it. If I use the 'Light' blendmode, the objects appears red

Here 3 screenshots with a simple scene with light probe

- Alpha Blend Enabled
- Light Blend Enabled (objects behind appears red)
- No Alpha

I'm trying to achieve a material used for glass panel with reflections from the Light probe.

 

[macklebee]

Screenshots are nice but a map would be better.