How would you render something like the attached? Color for clear objects is controlled by the specular transmission, but specular transmission cannot reference an external texture like a jpg with gradient.
Hi Joe! Welcome to the KeyShot Forum!
Lately, I've been exploring materials, textures, and lighting FX through some Coca-Cola themed renderings. Saw your post and thought it'd be a fun challenge to see if I could achieve a selectively tinted bottle effect like you're looking for. For the rendering below I created a cyan gradient texture map in Photoshop that fades to transparent on top and bottom. Then I adjusted the overall opacity to 30%, exported the file as a .png to communicate transparency and used it as a "label" on the bottle glass material. After applying the label with cylindrical texture mapping in Keyshot, I adjusted the label intensity to 2.5 to help pop the color. I also did a little post adjustment in Photoshop to pop the rendering and color even further. Hope this gives you an option ;)
Really well done - thanks br3ttj!
Thanks Thomas, it was a fun challenge!
Another tip I learned for getting glassware to read more realistic is to apply a subtle ripple bump map to the inside surface of the glass. As evident in Joe's picture, glass cools unevenly during processing. By incorporating those imperfections I was better able to tease out the pooling of highlights and shadows that give glass its character. I used KeyShot's "wavy-bmps-normal.jpg" normal map and just scaled it up. In the rendering above it may be a little overt and could be dialed back just a bit.