Author Topic: V-Ray Sphere Fade  (Read 1804 times)

2020-06-18, 09:40:00

Romas Noreika

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Hello there everyone,

I have a quite important question since I switched to Corona and corona workflow has been dominating my workflow now. I have a question in regards of re-rendering  regions in animation.

Example: when I was rendering animations with V-Ray in full frame and when the client had comments, I was able to save time in rendering (re-rendering just regions).

So lets just say the camera is following the Car driving from the side and in the background we have the whole site plan etc. And lets just say the client wants to change the cars number plates, rims  and the car color. So in V-Ray environment case I would create a sphere gizmo or a box gizmo centered to the driving car and give some bleed that would include the whole car and a bit whats around the car, for instance the cars shadow underneath the car. Also lets just say, there will be big glass windows, that when the camera is going to reach those windows the reflection is going to see the car also with all the new changes/amends. So in this case I can create how many gizmos I will need on windows, cars objects that will see the change and apply that in V-Ray Sphere Fade.

So whenever the camera is going to hit those objects they will be rendered and sphere fade will give them a fallow bleed so when you will blend/drop 16bit openexr old footage with the new one (vray sphere fade region frames) it will work like a charm. With a little cost of re-rendering. With corona I would have to re-render the whole frame again. I cannot apply a gizmo on an object, link it and tell corona to render it only as a region with a fallow bleed.

Is there a way or will be a way to do this in corona?

Please help.

RN

2020-06-18, 14:51:24
Reply #1

TomG

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You could use Render Selected, so long as you select the car and the windows it is reflected in for example. It will of course render the entire window rather than just the part with the car reflection, so depending on your scene (e.g. if the background window is the entire size of the frame), you would be rendering the whole frame indeed.
Tom Grimes | chaos-corona.com
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2020-06-18, 15:03:53
Reply #2

Romas Noreika

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I understand what you are saying. But lets just say the car is riding on a peace of road geometry which is for example 8 meters of road geometry in the camera frame/shot so I would need to select the car and the road because the road will be catching shadows from the car + reflections. So with corona I would need to render the whole road in the camera frame, I mean it will render the whole road peace in the camera frame. Rather than just rendering a region around the car with a fallow bleed. So you could slap it on top of your old frame footage in POST with transparency.

Now rendering a selected object in the view port, whenever you will want to slap it on top of your old footage you will get a black LINE edge around your selective render object, because the BG was always black so those black pixels will bake into the selective render region if you understand what I mean.

If you are doing this for a still render and if you are re-rendering that selected object without "clear frame buffer" on a already pre-rendered image/render you will not get the black line/edge bake, because it is baking what is around.

It is almost the principle of when you create a tree leaf for example and you paint green tone around the leaf texture for the alpha. So you will not get black pixel/edge around your leaves. I hope that makes sense.

I am just curious does anyone know how to overcome this animation region re-render issue like I would overcome very easily in V-Ray.

Best,
Romas
RN