Thanks for all your support. I could not get past the double colors I was getting using layer transparency. What I did do is after selecting the color scheme, double clicking on the color in the dialog box and change the color to a "true color" and increasing the luminance to a higher value. That did the trick. I don't know why I didn't try that ealier.
Do you mannaged to set surface transparency in C3D 2013? I was able to do it with C3D 2012 and previous versions.
I tried to set ALL my layers to 50% transparency and nothing. But if I explode my surface then it get transparent (but it is useless, hehe).
If I export do CAD then it works well. My problem is that I use a lot surface transparency while editing groundwork surfaces (cut and fill help me a lot to decide where to go). I was expecting that SP1 would solve it but unitll now I didn't find anything...
Diego Álvares Civil Engineer - www.trentoengenharia.com.br Autocad Civil 3D 2013 / 2014 - Infrastructure Design Suite Windows 7 64 i7 860 @2.80GHz 8GB Ram Quadro 2000D