zdepth problems in combustion with vray rendered images

do you experience problems with fuzzy edges when you use vray as your rendering system to channel the zdepth to use an rpf image in combustion? here’s help: first, turn on the ‘enable filtering’ check box for the zdepth render element; next, switch to adaptive subdivision sampler and check its ‘object outline’ and ‘normal threshold’ options. this will make it fine. you need the ‘enable filtering’ option in order for v-ray to actually perform antialiasing on the z-depth channel.