Vray difference between bump and displacement map

Bases the displacement on a texture map that is known in advance. The displaced surface is rendered as a warped height-field based on that texture map. The actual raytracing of the displaced surface is done in texture space, and the result is mapped back into 3D space. The advantage of this method is that it preserves all the details in the displacement map. However, it requires that the object has valid UV coordinates.

You cannot use this method for 3D procedural textures or other textures that use object or world coordinates. Specifies the amount of displacement. Higher values produce a greater displacement effect. This value can also be negative, in which case the displacement pushes geometry inside the object. Specifies a constant which will be added to the displacement map values, effectively shifting the displaced surface up and down along the normals. This value can be either positive or negative.

Keep Continuity?? When enabled, V-Ray tries to produce a connected surface. Use it when you get splits usually around sharp edges in the displaced geometry. See the Keep Continuity example below. View Dependent?? When enabled, the Edge Length parameter determines the maximum length of a sub-triangle edge, in pixels. A value of 1. When disabled, the Edge Length value is the maximum sub-triangle edge length in world units.

Edge Length?? The scene on the right is a couple of boxes with mesh subdivided and corners rounded with the Turbosmooth modifier, collapsed to Editable Poly and VRayDisplacementMod applied. The blue squares mark the areas which will be zoomed in and compared in the table with the tests.

We will test the amount of resources needed to render a scene with displacement in 2D mode with textures in various resolutions. Then for comparison, we will render the scenes with 3D mapping View-dependent set up to use the same amount of RAM as the scene rendered with 2D displacement mode, and compare the quality and render times. According to the tests, the scenes with and px displacement maps are not looking satisfactory. The texture pixels are visible in displacement. In the and renders the pixels are not so visible but there are visible low-quality artifacts on the steep edges of the rocks.

The and displacement textures rendered almost the same images, so we can discard the image which uses much more RAM, and leave the one. The tests of the scene showed that RAM used by 2D displacement starts to rise quickly with the biggest maps. The 3D mapping with similar RAM usage gave a little more blurred displacement detail but it rendered much faster. In the case of the second scene, renders from to px maps are not looking satisfactory.

They have visible displacement map pixels which vanish at resolution. A 3D mapped scene set to render with 10GB RAM used we used 8K texture gave an image with quality somewhere between and and px of the scene in 2D mode. Also, the scene set to a maximum possible Edge Length of 2px and 57 RAM usage has less crisp detail than 2D displacement scene. However, it rendered much faster. If you need to run quick tests and shorten the time till you see the first pixels of the image, you can set the resolution in the modifier to a low value and set it back to the full value for normal rendering.

Subdividing the mesh before applying VRayDisplacementMod saves a lot of RAM, sometimes at the expense of slightly longer rendering times. After reaching a certain threshold of mesh density, the use of RAM starts to grow again. It loads and subdivides one face after another, so if the model is built from a few big faces, V-Ray will need to work on very large parts of the model and calculate a very large mesh for that face. That can produce the need for more RAM.

On the other hand, when V-Ray starts the initial calculation of the mesh, it needs to keep as much of the displaced mesh in the memory as possible. This way it can calculate the adjacent edges to keep its continuity. If the displaced mesh gets too dense, it has to keep too many elements in the memory and take too much RAM. Adding more subdivisions to the mesh before applying displacement can also help you to get better quality and get rid of the displacement artifacts.

TIP: You may try to use Brute Force as a secondary bounce engine since it is more optimized in terms of memory usage. Light Cache has to load all the assets in order to proceed with calculating while BF and Irradiance Map can to it per bucket.

TIP: In some cases, it may be possible for you to combine either a bump or normal map with a displacement map on the same model. You can use displacement to bigger features and normal or bump for the finer detail. V-Ray renders the whole model with displacement applied, even the parts which are not visible in the shot. They can be visible in reflections or refractions through and affect rendering GI, so they are taken into calculations.

In the tests below we moved the models just outside of the camera view. In the first two tests models with displacement reflect on the surface of the ball. The amount of used resources drops down only when we delete the models with the displacement. If we need the displacement to be visible only in reflections, in many cases just the bump mapping is enough.

We can delete the parts not visible in the shot, for example by cutting and detaching the part of the model which is not visible in the frame. The polygons from behind the model can be deleted with no effect on the rendered image. The amount of saved RAM is substantial though. Sometimes using displacement is not needed at all for achieving a good result. In cases when the object is far away from the camera, the regular bump is enough.

When can I use bump to cut on the used resources without a visible drop in the quality of my renders? Every time when the models are not visible in the shot, but visible in reflections. Every time when the models are not visible in the shot but affect GI. In this case, you can keep only the diffuse map turned on with no displacement nor bump used.

When the displaced model is far away from the camera or the details are not visible because of the low resolution of this part of the image.

Between bump displacement vray difference map and 2022 us presidential election betting odds

All world sports betting app review think

To do this, start by applying a color texture to your face in SketchUp. Then, go into your maps section of your materials editor and add a bump map material. As you can see, in your rendering, you know have that bump map applied to your white material. The best way to do this is to use a texture type that actually has a bump map image associated with it. The Vray materials built into Vray have actual bump map images associated with them that help you get a much better result.

What a displacement map does is actually move your geometry within your render to give you an accurate simulation of a rough material. So the first thing to note when working with displacement mapping at least in my experience , is that it really works best with materials applied to groups of geometry. I was not able to get it working with raw geometry. What does a displacement map do? Displacement maps, although they can be derived from the same type of image as a bump map, are much more powerful.

They can truly deform geometry up to and including edge detail, making them ideal for a much wider range of uses such as terrain creation sometimes a displacement is called a height map for large-scale deformation and detail modelling.

The reason that displacement maps are not as commonly used is that they can be computationally intensive and they tend to like high-resolution geometry to work with, which can make them less than ideal for some tasks. Either way, understanding bump and displacement maps will enable any artist to add detail to their models opens in new tab more quickly and intuitively than through other image-based methods.

When to use a bump map A bump map modifies the surface of a geometry At its simplest, bump mapping only modifies the surface of a piece of geometry, whereas displacement mapping is actually altering the geometry. Bump maps are great at adding a lot of low-relief detail on low-polygon objects, so a one-polygon wall could show hundreds of bricks thanks to bump mapping.

It can be an issue when edge detail needs to be shown, as bump mapping does not work with side detail — it only shows the true underlying geometry. When to use a displacement map A displacement map alters the geometry itself Displacement maps are a hugely powerful technique as they can intuitively allow model detail to be added with a simple greyscale image.

A perfect example is when they are used as a simple method of creating the height data for a landscape. As displacement maps also sometimes known as height maps are modifying the underlying geometry, they need higher-resolution meshes to work with than bump maps, which can make them slower to work with.

But they can produce stunning results. Combine maps Combine both maps to add a true relief Bump and displacement maps can be used in conjunction with one another. For example, when using displacement maps to add true relief to a landscape, a bump map can be used to add additional noise to the surface. This takes some of the computational weight away from the displacement map, allowing faster performance for negligible image loss.

Understanding the properties of when and where to use bump and displacement maps can radically improve models and scenes. Height differences between maps Be sure to double-check displacement maps brought in from external software Both maps display height differently because of the underlying science behind each.

However, this can also be true of the software being used. Displacement maps especially should be double-checked in the final render software when brought in from an external painting programme or other render software; there can be differences between how they are displayed, especially with different levels of geometry.