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I´m trying to create a material for a ground object where I want to use AO as shadows and everything not shadowed to be transparent. I have tried two solutions but I´m having issues with both.
The scene is lit with a single dome light with an HDRI. For render speeds I need to use dim reflection distance on my materials so I need to use the same HDRI in the global override reflection slot.
1. In the first solution I have a vray material with a vray dirt map in the refraction slot. This looks great. I have glass materials in the scene, and for them to not look too dark I have to use the HDRI in the global override refraction slot as well. When I do that, my AO shadow doenst look right because it refracts the environment instead of black.
2. In the second solution I have used a vray dirt map in the opacity slot. By tweaking the falloff and distrubution I can get something that looks OK, but when I open my rendered PNG in photoshop and add a background layer the AO gets very black. Its like there isnt any gray scale values, its either black or white. It looks good against photoshop checkered background before I add a background layer.
The scene is lit with a single dome light with an HDRI. For render speeds I need to use dim reflection distance on my materials so I need to use the same HDRI in the global override reflection slot.
1. In the first solution I have a vray material with a vray dirt map in the refraction slot. This looks great. I have glass materials in the scene, and for them to not look too dark I have to use the HDRI in the global override refraction slot as well. When I do that, my AO shadow doenst look right because it refracts the environment instead of black.
2. In the second solution I have used a vray dirt map in the opacity slot. By tweaking the falloff and distrubution I can get something that looks OK, but when I open my rendered PNG in photoshop and add a background layer the AO gets very black. Its like there isnt any gray scale values, its either black or white. It looks good against photoshop checkered background before I add a background layer.
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