Better Transparent BSDF #68454

New Issue

Clément Foucault · 2019-08-09T15:20:59+02:00

Clément Foucault commented

2019-08-09 15:20:59 +02:00

Using dual source blending, we can replicate Cycles Transparent BSDF behavior which is multiplicative and additive at the same time.
This would increase compatibility between both engine and remove the uneeded complexity of having separate Additive and multiplicative blend modes.

Estimate : 1 week

Using dual source blending, we can replicate Cycles Transparent BSDF behavior which is multiplicative and additive at the same time. This would increase compatibility between both engine and remove the uneeded complexity of having separate Additive and multiplicative blend modes. Estimate : 1 week

Clément Foucault commented

2019-08-09 15:20:59 +02:00

Added subscriber: @fclem

Demeter Dzadik commented

2019-08-09 17:50:31 +02:00

Added subscriber: @Mets

zebus3d commented

2019-08-10 01:12:03 +02:00

Added subscriber: @zebus3dream

Paul Szajner commented

2019-08-12 06:20:08 +02:00

Added subscriber: @sozap

Paul Szajner commented

2019-08-12 06:20:08 +02:00

Additive and multiplicative blend modes can be nice to keep for some cheating / NPR stuff.

Clément Foucault commented

2019-08-12 20:51:40 +02:00

Added subscribers: @WilliamReynish, @dfelinto, @brecht

Clément Foucault commented

2019-08-12 20:51:40 +02:00

@sozap these modes can still be achieve using a combination of transparent and emission node. Also using the shader to rgba node to transfer their color in a NPR way is better as it clearly shows that this is incompatible with cycles.

@brecht @dfelinto @WilliamReynish If i'm supposed to remove the old Additive and Multiplicative blend mode, should I:

A : Remove them and just let artists figure out what's wrong with the file (or at least do an alert in the bottom bar about the error). We did that at some point of 2.8.
B : Create the replacement nodes inside versioning code.
C : Create the replacement nodes inside tree evaluation code and keep the blend modes. But this add discrepancy between cycles and eevee.

@sozap these modes can still be achieve using a combination of transparent and emission node. Also using the shader to rgba node to transfer their color in a NPR way is better as it clearly shows that this is incompatible with cycles. @brecht @dfelinto @WilliamReynish If i'm supposed to remove the old Additive and Multiplicative blend mode, should I: - A : Remove them and just let artists figure out what's wrong with the file (or at least do an alert in the bottom bar about the error). We did that at some point of 2.8. - B : Create the replacement nodes inside versioning code. - C : Create the replacement nodes inside tree evaluation code and keep the blend modes. But this add discrepancy between cycles and eevee.

William Reynish commented

2019-08-12 20:58:39 +02:00

@fclem IMO we should ideally do B. If not, then we can also accept small incompatibilities between releases, although it needs to be mentioned in the release notes.