Question [Solved] Blending of Textures

Dear all,

I (beginner) struggle with a apparently simple problem:

I have a shader which applies different textures based on alpha maps on my generic created terrain. Now i try to blend different textures to each other where they have contact. My problem is that where the blend happens the texture is brighter. See pictures:


The alpha map is a map with black and white areas, choosing the corresponding texture where my area is black. The blend happens with a gray scale value.

I understand my problem as follows: I have texture A which uses the alpha map black = normal display. Then i try to add a gray-scale value (for example 0.5) using texture B on top of it. This brightens my texture.

I cant figure it out how I can normalize my two textures without turning every other area (where only 1 texture is present) down as well. Is there a way to apply normalization only where this situation of 2 alpha maps values (in total > 1) are present?

Does someone has experience with something similar and can point me in the right direction? Did I present my problem in a somewhat understandable way?

Thanks a lot in advance!
Cheers Ori

 

When you say "blend", what do you exactly mean? Are you multiplying two values together, for example? I would imagine you could just use a lerp to mix two values together based on an alpha value (0-1 range.)

 

Hi Olmi - thanks for your reply!

I multiply the alpha values (ranged from 0 to 1) and then later add the textures. The multiply and add subgraph are just several multiply and add nodes in series.



When i lerp instead of add then i have the blend textures with the expected brightness and where only 1 texture is it is too dark... (quasi offset of the add on the alpha map...)

 

Hi Everyone,

Quick update - I finally figured it out! When i create my alpha map i just subtract 1-blend value from the previous tile and voila, works like a charm!

Thanks Olmi for your help!