How do I create realistic textures?
Have you ever wondered how you can go from this…
Textures (see also; materials) are painted onto faces within your 3D modelling software, and these can be flat colours or image-based.
In our first example, we are going to begin developing a wood floor texture – and so we need to find an appropriate image to use here.
In this example, we are importing Extreme Texture’s Antique Oak into SketchUp as a Texture, which will allow us to paint this onto a face.
Now is a great time to check the scale – within the Materials panel of the tray; use the global size settings to ensure that our boards are scaled appropriately. To help me do this, I like to draw a guideline that equals the desired width of the board, so that I have something to reference.
Here we can see how important it is for our material to be seamless. There is a vast collection of seamless materials available from the sources mentioned above!
We now have a high-quality, seamless texture applied to our model which is the correct scale.
Why does this not look realistic yet?
As covered on our Access into V-Ray for SketchUp courses; most solid materials can be divided up into three maps; diffuse, reflections and roughness.
The diffuse texture is what we see within our SKP model. This can be considered our ‘base’ texture and defines predominantly what the material looks like without lighting or roughness effects applied.
If light bounces off an object and is not absorbed, then one sees a reflection. V-Ray has the ability to control the intensity and glossiness of reflections of materials within the scene by using reflection or specular (see also; spec) maps. For example, areas on a texture where one would see a glossy finish would show up as white on a spec map, whilst matt areas appear darker.
Not all materials are as flat as a mirror; for this, we use a bump or normals map. Areas on a bump map that are darker are shown as depressions on the surface of the material when rendered, whilst the opposite occurs for lighter areas. Be careful with the intensity of bump or normal values – anything above 1 is normally not required.
Hold on… how does glass work?
As we can see, the lighter we make the refraction colour, the more ‘glass-like’ our material becomes.
We can deduce that the setting to use that controls the transparent properties of glass is called refraction. Like with the reflection glossiness, we also have the opportunity to create frosted glass by adjusting the refraction glossiness value!
What about fabrics?
Depending on the qualities of the fabric in question, we would advise taking a look through the preset textures within V-Ray…
Once a similar fabric has been chosen, you can edit the colour and tones of the diffuse, by right-clicking on the bitmap slot within the Diffuse, and wrapping it in a Colour Correction. Here you will be able to modify the hue, saturation, brightness and contrast, to your liking.
Fabric textures now benefit from a new feature in V-Ray 5 for SketchUp where you can add a translucent layer for extra realism.
What if my texture seems to emit light?
One can add emissive layers to all materials within V-Ray as shown…
You can also copy your Diffuse into your Emissive bitmap slot…
Now that you know how to create realistic textures; Wrapping is a term we give to the application of a material to multiple faces within our model – much like the wrapping of a present with wrapping paper. We cover this in great detail on our Access into V-Ray for SketchUp courses.
We hope that you have enjoyed our texturing tips!