On Thursday 30 May 2019 14:34:33 Jason Saunders wrote: > Hi everyone, > > Long time no chat, but hope everyone is well. > > Just wondering is anyone remembers if or how it is possible to cast > shadows onto an illumination shader please? > > For example, > > 1. I have a shader with a texture/photo set to output illumination > instead of colour, so the original photo remains unchanged with scene > lighting. 2. I’ve applied the phot/illumination shader to a plane > rectangle. 3. I now want to stand an object in front of the photo > (illumination) shaded rectangle and have that object cast a shadow onto > the photo. > > Does anyone have a tip for this please as by definition the illumination > shader will not receive shadows normally? > > Many thanks, > > Jason
I don't think that you can do this just within R3D. The way I'd go about it would be to do two renders: first render the full image, at the desired quality, including the photo-lightsource, and then do a low-quality box-render of the shadowed area of the photograph, but with the photograph area (and its illumination) replaced with plain white, so that you're just rendering the shadow on a plain white area. Outside of R3D, use the box render as a guide in your IMP of choice to create a black (0, 0, 0 RGB) patch which you can then composite over your quality render, adjusting the alpha of the patch layer to get the shadow density you want. I think that would work. LeeE _______________________________________________ User-list mailing list [email protected] http://realsoft.com/mailman/listinfo/user-list_realsoft.com
