Bof, I was just supposed to answer an user’s question over at CGtalk and it ended up as a mini tut with a blend. Sure users of Elysiun should not be left apart. Here it is:
I use Orco, a simple grid, and a simple png file of leaf I scanned and postprocessed in Gimp. This png is lowdetail for download purpose, should be a minimum of 1000px in loseless format.
1-Scan you leaf, flat on the glass. For this I used one of our famous maple leaf from Canada!
2-Go in your favorite paint program, Photoshop of Gimp.
3-Add a alpha channel and put all but the leaf in clear alpha, save in a format supporting alpha, and supported by blender like png, tga, psd.
4-In Blender add a complex grid so you can give it some bump, using the subsurf with a lowpoly grid is also an option.
5- Add a material
6- Drop alpha to 0 in “Material” panel and drop spec to 0 in “shader” panel.
7- Go in “mirror transp” panel, enable Raytransp.
8- Go in texture and add a texture channel, Go to add an other one but instead of creating a new, use the same by selecting it using the pulldown menu.
9-In first channel, go in the “Map To” panel and select col and alpha.
10-Select the channel 2.
11-In “Map To” panel, select nor and spec.
12-In this same panel, drop the “var” to 0.5. And cranck the Nor slider to 5.0
13-Go in texture buttons(F6Key)
14-In one of the 2 channel (it’s the same!) add an image, load you file with the alpha channel.
15-In the “Image” panel, press the “Usealpha” button.
16- Also, press the “clip” option. If it’s not already done (maybe not necessairy).
Download the blend here.
Some example, not all in the blend though: