Post-3D Rendering Effects

3D ANIMATION :

There are a number of appealing effects that rendering engines can perform after the image is closed rendering. These "post-rendering effects" are needful effects drawn on the final render after the render has been calculated. For instance, glow is a post-rendering effect. That is why a glowing light bulb does not show up in a reflection.

Post-3D Rendering Effects

By the time the 3D application applies the post-rendering effect, all reflections and lighting concerns have already been addressed. Despite their limitations, post-rendering effects add some very nice touches to figures or animations. The following are some post-rendering effects and examples of their use.

Depth of field: We may not consciously consideration it, but our eyes are not able to have all things within our site in focus all the time. You can focus on the rubber ducky sitting atop your monitor, but the wall 10 feet behind it is admittedly out of focus.

Cameras (both still and video) work the same way. We can have a focal point, but there can be objects in front and behind that focal point that we can see but are out of focus.
Applications allow you to operate the depth of field in different ways. Usually, they cope it through a camera object. The camera object, besides having range of view pyramids to adjust, will also have discrete planes defining where the view is in focus and where it is out of focus.

In still renderings, depth of field is an efficient touch of realism.Motion blur. Have you ever tried to outline out how he does it by pausing your popular Jackie Chan film in the midst of one of his acrobatic feats? The follow is inevitably a blurred mess. This happens because the shutter of a camera (still or video) opens and closes too moderately to capture pristine shots of fast movement.

When the shutter is open, fast-moving objects cover too much ground, leaving a smeared or blurred image. 3D applications do not have that problem since they report each frame as though petition were frozen in time, but you can tell 3D applications to pretend that they are a real camera and originate petition blur. They do this by taking a given frame and rendering the movement within that frame for that frame, and then shifting the movement a bit before and a bit after and render those frames.

They then composite the frames before and after the original frame into a blurred image. This gives a nice illusion of blur due to slow camera shutter speed. This is a great follow and helps make 3D animations look much less sterile than they tend to be by default. However, the drawback is that to perform petition blur, the 3D application must render the same scene many times.

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