why is the texture map to Transparency of Emissive material not supported by GPU?

[Ymauchi]

Simply, why is the texture map to Transparency of Emissive material not supported by GPU?

tested on V-RayRhino 3.60.02

[Peter.Chaushev]

Hello, Yuji,

This limitation is due to Emissive materials using an older plugin structure not supported on GPU. This will be amended in the next major version of V-Ray for Rhino.
As a temporary workaround, you can use a Blend Material to achieve the desired effect. Simply follow these steps:

1. Create an Emissive material and slot the image file as Diffuse texture. Do not bother with the Transparency parameters

2. Create a Blend Material, add a Coat and slot the Emissive material within.

3. Copy the Emissive material’s diffuse texture. Create a Color Correction texture into the Coat’s Blend texture slot and paste the the other texture within (or alternatively just use an opacity mask texture).

4. Rewire the RGB channels in this case to Monochrone and adjust the Brightness and Contrast parameters accordingly to create the Blend mask.
Adjustments may vary depending on the source image used.

5. Apply the Blend Material instead of the Emissive and the GPU render output will appear correctly:

Kind regards,
Peter

[Ymauchi]

thank you for the advice.

Despite being supported by the BlendMtl method, it was strange that it is not supported by a simple Emissive Transparency.

expect it to update