Hello and welcome back to another VRay for Cinema 4D tutorial , its been a while since we made kinda of a large scale tutorial , so i thought its the time for it , especially now that we have to a good extent , a stable 3D motion blur within VRay for C4D ( 1.8 ) .
This tutorial is going to be split into three parts and will focus mainly on motion blur with VRayforC4D , will learn the basics of it and how to mange it using our shutter and geometry samples , And then finally will more fun with it creating the well known panning effect using . lets get started
Motion Blur Workflow with VRayforC4D – Part 1
This first part is going to be a short article explaining motion blur basics and how its effected by the shutter speed, and in the next part will recap and see how to actually set it up in c4d and talk about the samples , and finnaly will be showing you how to use motion blur to create something looks cool like a paining shot
Motion Blur ?
Motion blur is mostly seen in moving objects and its something that occurs that can be seen by the human eye and cameras , it can be captured in different ways whither its a video or a still image .
The equivalent of a normal human eye like motion blur ( for a video being shot at 24 frames per second ) is 1/48 of a second or 180 degrees for movie cameras , 1/48 of a second is the time that the shutter spends between each frame of an animated sequence ( video ) and we can use that to control the amount of blur or motion blur that occurs. higher frame rates require higher shutter speeds , so say if you are working with 30fps you should work with a shutter of 1/60 of a second to produce normal looking motion blur .
To keep it simple we are going to focus on the shutter speed rather than the shutter angle which is used for movie cameras because its whats commonly used and its easier to understand in our 3d package , you can always convert the shutter speed number to match the shutter angle on your own and there is fair amount of info for that on the web .
Slower shutter speeds can be also used to create dramatic effects like those seen in panning shots or smooth water falls for example , will get to that in Part 3 .
This is an image by freshphotographer.com showing how changing the shutter speed can greatly effect the amount of motion blur captured in still images . you can see that the fast shutter speed captured a very sharp image of the rotating object .
Motion Blur In Cinema 4D and VRayforC4D
Same rules apply when we are working in a 3D environment of a software such as Cinema 4D no matter what render engine you use , as long as it has a good Motion Blur engine , the motion blur will be effected by the built in shutter speed or angle with the frame rate for animations .
There are few things to consider and the first thing is that you should always consider working with motion blur with the rendered animations rather adding it later in the comp software like after effects using vector passes , that’s because motion blur isn’t slow to render like the depth of field in 3d and can be produce real camera-like effects
We should also pay attention to our animation wither the animation is objects moving along XYZ or rotating or both at the same time because this will effect how much we can optimize it via the geometry samples in vray .
this is an example of a rotating object to see how the Geometry Samples effects our motion blur . In this render we used a slow shutter speed ( 1/8 ) just to see how the geometry samples parameter works with vray .
We talk more about the optimization of the samples and other things in part 2 so make to sure to watch the video for that
In Part 3 we are going to put what we have learned so far and create a panning shot with motion blur in vray
– Make sure to use the latest VRayforC4D update ( latest service release from the forum )
– and also Always try to bake your animation . VRay motion blur depends on frames mostly for its motion blur and there for baking your animation ( PLA ) could solve some of the strange results with it .