19-05-2020, 05:06 PM
(This post was last modified: 19-05-2020, 06:01 PM by josemendez.)
Hi there,
Glowing is out of the scope of Obi or the fluid renderer, and must be implemented separately.
A surface is emissive when it emits light. In absence of participating media, an emissive object does not "glow", it simply looks brighter. So one could consider glow as a poor-man's substitute for volumetric light scattering, and it is not the same as emission, but rather a consequence of it under certain conditions.
Glow is generally done by adding a blurred version of the emissive objects on top of the image. So in the case of glowing fluid, you'd have to render the fluid to an off-screen render target (like you would with any emissive object), blur it (downscale + separable gaussian is a good option) and then add the resulting buffer on top of the existing frame. As you see you can't achieve this by modifying the fluid renderer or its shaders, it is a completely separate thing that happens as a post-process.
Regarding not being able to see the fluid, make sure your particle renderer radius scale is high enough for particles to overlap. Also make sure you use the included fluid shaders, they're specifically built to render fluid, any random shader/material combination won't work. See:
http://obi.virtualmethodstudio.com/tutor...ering.html
kind regards,
Glowing is out of the scope of Obi or the fluid renderer, and must be implemented separately.
A surface is emissive when it emits light. In absence of participating media, an emissive object does not "glow", it simply looks brighter. So one could consider glow as a poor-man's substitute for volumetric light scattering, and it is not the same as emission, but rather a consequence of it under certain conditions.
Glow is generally done by adding a blurred version of the emissive objects on top of the image. So in the case of glowing fluid, you'd have to render the fluid to an off-screen render target (like you would with any emissive object), blur it (downscale + separable gaussian is a good option) and then add the resulting buffer on top of the existing frame. As you see you can't achieve this by modifying the fluid renderer or its shaders, it is a completely separate thing that happens as a post-process.
Regarding not being able to see the fluid, make sure your particle renderer radius scale is high enough for particles to overlap. Also make sure you use the included fluid shaders, they're specifically built to render fluid, any random shader/material combination won't work. See:
http://obi.virtualmethodstudio.com/tutor...ering.html
Quote:Disable the ObiParticleRenderer's "render" checkbox if you want only the fluid surface drawn by the Fluid Renderer to be visible. If you don't, both the fluid surface and the individual particles will be rendered. Using a radius scale between 1.7 and 2 for the particle renderer will ensure good particle coverage, and a fluid surface with no gaps.
kind regards,