12 Important tips for photorealistic 3D rendering
Countless factors are to be considered when it comes to product rendering for achieving believable and the best results. Getting the lighting and modeling correct is just a part of the process. There are certain 3D rendering tips that are really effective. Let’s scrutinize.
Start with a decent reference material
Scale to the real world
Mesh should be kept clean
Make the hard edges softer
Try to avoid Booleans where possible
Pay attention to even the minutest of details
When needed, make use of override materials
Incorporate a linear workflow
Control shadows using a VRayLight
Render in slots
In case if you a modeling something that exists already, gather maximum possible reference material to get the needed views from the top, side and front. This will make sure that the model looks perfect from all the angles. Always take care of the proportions as if you get them wrong, the final render would not appear to be photorealistic. Professional 3d rendering companies always keep this in mind.
Set the scene units correctly and model to the scale of real world for assuring photorealistic rendering. This is important to make sure that the scene lighting behaves just as in case of real life. This helps in future-proofing as well when you need to introduce any sort of dynamics later on, like that of cloth or liquid, that depends on your actual units for setting up correctly.
It’s always good to assure that the mesh is clean as well as comparatively low-poly. This is one of the proven product rendering techniques and helps in keeping the scene size lower thus making the complex models easily workable. Also, you model will be appropriate for any scenario. TurboSmooth modifier is a great option to choose.
There are rarely any sharp edges for the actual real-world objects. So, by softening the hard edges, you can make the models look realistic. Also, when illuminated, these edges will be nicely highlighted. However, chamfering them can be a bit tedious when the models to work with are complex.
When it comes to the process of 3d modeling of non-organic shapes, you may be tempted to incorporate Boolean holes to eliminate the complicated process of making the holes using your hands. For low-resolution renderings, this strategy may work out well. However, when you deal with renderings with high-resolution, this produces results that are unpredictable. High quality 3d rendering benefits can’t be overlooked, so, this has to be kept in mind.
Besides, when the mesh becomes untidy, it will not be able to refract and reflect the lights in the right way. Booleans may change the refractions and reflections in the model, therefore, it is advisable to avoid them as much as possible.
In order to make holes on a flat surface, the mesh has to be converted to an editable poly. You need to chamfer a particular vertex from the ‘Vertex Selection’ option. You will get a square shape, within which a diamond-shape will be visible. You need to cut the corners of the squares using the ‘Cut’ tool. Now, you need to scale up the four points at the side of the diamond shape, which will result in a circular image. Now, the faces of the circle have to be deleted and the mesh has to be extruded. You need to incorporate a turbo Smooth and this will help you to get a perfect, round hole.
Small details in 3D product modeling have the capacity to alter the whole level of perception. It may tempt you to proceed with the shortcuts and ignore small details that are not clearly or easily visible. These minutest details in fact are highly influential in tricking the viewers to make them believe that the render is real.
When a product is rendered in a studio, images can be overpowered by the background colour. This can affect the reflection, shadow colours, GI and refraction in 3d rendering and visualization. This may be fine in certain cases but a lot of exceptions are there. The effect can be manipulated by make using of a VrayOverrideMtl which can be really helpful.
In order to make the results of your rendering realistic, use a 32-bit linear workflow. The 8-bit images, like .jpg, .tga and .bmp files get gamma-encoded when they are saved. This makes them look accurate on the monitor. However, the visible image is not the actual one, but a misinterpretation.
When these images are displayed, they look much darker. Therefore, it has to be adjusted when you light the screen. You need to add more lights and their intensity has to be increased. This is a time-consuming process and will increase the overall render time. You can render the same light settings, with a linear workflow devoid of it.
While using a linear workflow, you can use real-world settings to light up the scene. Evidently, no lighting tricks are necessary to make the images look realistic.
As a result, you need not deal with contrasted renders and highlights that are blown out. This 3D lighting techniques make the colour reproduction and lighting more natural.
When you light up products in a studio, three-point lighting proves to be an ideal set-up. This setting consists of a key light, a fill light and a back-light. The key light, being the primary source of light, brightens up the product. It strongly influences the look of the shot. On the opposite side, the fill light is placed and it has a lower intensity. The function of this light is to eliminate the shadows produced by the key light. You need to place the back-light behind the product, in order to make look it three-dimensional. It separates the object from its background.
For new users, this setting can be a bit difficult to incorporate. However, experienced professionals can deal with these settings with adroitness. Well, you cannot term any setting as ‘right’ or ‘wrong’. It is dependent on the scene that gets illuminated and its desired look. However, the settings presented here will help the users to get started started to make VRay render more realistic.
It is recommended not to use a VRaySun or directional lights to produce sharp shadows. A standard VRayLight will serve the purpose. You may scale it down, which will help you to obtain a higher intensity.
When you apply shadows using this mechanism, you gain a complete control over the sharpness and softness of the shadows. A small light will produce a sharper shadow, as its intensity is high, while a larger one, with low-intensity, will produce a softer shadow.
You may disable the Affect Reflections and Affect Specular in the VRayLight settings. However, the light will influence only the diffuse channel. When you incorporate one of these lights in a three-point lighting set-up, you can get a better result. The product will be well-lit and the sharp shadows will be produced only in a single direction.
When you render in passes, time can be saved and quality can be improved. It may take some time for setting up the scene but when you are rendering images with higher resolutions, rendering of different phases can be done simultaneously which is very beneficial.
If you are looking for a 3D rendering services, get in touch with MAP SYSTEMS. We know the right things to do for getting you the best results.