Register now to gain access to all of our features. Once registered and logged in, you will be able to contribute to this site by submitting your own content or replying to existing content. You'll be able to customize your profile, receive reputation points as a reward for submitting content, while also communicating with other members via your own private inbox, plus much more! This message will be removed once you have signed in.
According to the houdini documention: http://www.sidefx.com/docs/houdini/nodes/obj/geo [www.sidefx.com] For correct matte shading of volumes: Add the vm_matteshader property to the object. Create a Volume Matte shader. Set the density on this shader to match the density on the geometry shader. Assign this shader to vm_matteshader. Does any one have an example of a volume matte shader? I want to hold out particle renders with a volume hold out matte. i.e. where the density of the volume = 1, the particles are not visible in RGB and A. Where the density of the volume = 0, the particles are visible in RGB and A. And the particles are correspondingly partially visible for all values between 0 and 1. I'm trying to make particles partially visible behind a translucent object. Any pointers would be much appreciated. thanks
Hi Mark, goldleaf was asking about custom projections in the houdini openGL viewport on my behalf. Thanks goldleaf! It sounds like from your description, unfortunately, it's currently not possible. However, I just wanted to check into your cubemap idea. Here is an article about how someone creates a real time openGL fisheye in unity: http://paulbourke.net/dome/unity3d/ i.e. 5 cameras facing outwards, each with a 90 degree fov. their resulting openGL views are then mapped onto a spherical piece of geometry with their UVs set appropriately, in front of the scene camera. Such that the scene camera sees the view of the 5 cameras mapped onto the spherical geometry in real time. Giving the illusion of a fisheye ray. Just wanted to check if there is any possibility of mimicking this approach, before closing this thread. thanks