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As a final look at our Image Sampling Renders, we thought it would make an interesting exercise if we were to just spend a moment to comparing our final renders from each of the Image Sampling Engines. To do this of course we need to go into our Adobe Bridge application, we'll follow through our Exercise_Files, into assets, come into Ch06, and come into this Copy_Final_Randers folder. Now, I'll just select our Fixed Rate Render, use the Spacebar to maximize, and then just left-mouse click to push in.
Really what we want to do is just step through each of the renders and let you evaluate the quality in them. So here is our Fixed Rate Render, here we have our Adaptive Subdivision Render, and we have our Adaptive DMC Render. As you can see there is very little to choose in terms of quality between each of these images. There are just subtle shifts in the way each Image Sampling Engine has handled different paths of the scene's detail. If we come down to the bottom of our images however, you can see that there is quite a bit of difference in terms of the render time taken.
Our Fixed Rate Render took 1 hour and 28 minutes to come in. If we switch to Adaptive Subdivision, you can see the adaptivity brings the render time down a little bit to 1 hour and 5 minutes. And when we come to our Adaptive DMC Render, you can see that we drop all the way down to just under 28 minutes. Clearly, the Adaptive DMC engine was able to handle the scene in a far easier manner than the other two. Now, of course as we change scenes, we will want to test our Image Sampling Engines.
They do have differing strengths and weaknesses and your scene may suit one engine above another. In terms of general guidelines though, we can make some suggestions as to where each of these engines can be employed. So the Fixed Rate Engine, because it has this single Subdivisions parameter oftentimes is employed as a preview render engine. We can simply set 1 parameter and off we go. We get our test renders back very speedily indeed. With regards to the Adaptive Subdivision Engine, well, it works well in scenes with very few noisy effects, but it can also work extremely well on scenes that have lots of black color.
It will be very fast and give you high quality renders in those situations. Ultimately though the Adaptive DMC Engine is the one regarded by V-Ray users as the best choice for general 3D work. It handles noisy effects very well, and because it is adaptive, we can tune it to be very fast indeed. Of course the final choice of Image Sampling Engines and the settings we use will be up to us as the rendering artist. What we hope we've done with this chapter though is just give you a good foundation, a solid starting point from which to build your own Image Sampling knowledge.
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