Maya Ellison
Creating plastic material in VRay involves a range of steps that take into account the parameters and physical properties of plastics. These include IOR (Index of Refraction), reflectance, and bump mapping. VRay materials are often used for professional architectural visualization of interiors, product design, and 3D modelling. To create translucent plastic, tutorials recommend using VRayFastSSS2 with V-Ray for 3ds Max, adjusting the scatter radius and scale parameters according to the dimensions of the object.
| Characteristics | Values |
|---|---|
| File Format | 3ds Max + VRay |
| Version | 2.40.04 or higher |
| File Type | .<co: 1,2,4>max</co: 1> |
| File Size | 28 KB |
| Material | VRayFastSSS2 |
| Base Material | Plastic |
| Coat Material | Gold, Front Label |
| Unit Scale | Centimeters |
| Single Scatter Parameter | Raytraced (refractive) |
| Color Mode | Sub-surface color, Scatter coefficient + fog color |
| Index of Refraction (IOR) | 1.575 |
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What You'll Learn
Translucent plastic
Creating translucent plastic in V-Ray can be a challenging task. One recommended approach is to use a VrayBlend with two layers to simulate the effect. The first layer, which provides the translucency effect, has no reflections and a Refract Gloss set to around 0.65. This value can be adjusted to control light spread within the object. Translucency is activated and set to Wax mode, and colour is added to the Back-Side colour slot and the Fog colour slot.
To add the missing elements, a new layer is required in the blend. This layer should be set up as a highly refractive plastic with strong reflections, and the gloss adjusted as needed. The Refraction IOR is typically used for very thin objects, but for thicker geometries, the standard range of 1.45 to 2.4 for plastics can be applied. The two materials are then blended together by adjusting the blend amount colour.
For a more solid, translucent appearance, darker colours are preferable. Conversely, for a more transparent look with less SSS, increase the brightness of the blend amount. Different colours of plastic can be achieved by experimenting with the colours in both shaders, ensuring they are similar in hue (Diffuse, Back-Side, and Fog).
For a shampoo bottle, the VRayFastSSS2 material is used with the colour mode set to Sub-surface colour and scatter radius, and the single scatter set to Raytraced (solid). The liquid content is a VRayMtl with black diffuse colour, light grey reflection colour, and reflection glossiness set to 0.85. The Refraction Colour is light grey, and the refraction glossiness is set to 0.99.
The scatter radius and scale parameters are set according to the dimensions of the bottle geometry. The Single Scatter parameter can be adjusted to achieve different looks, and changing the mode to Raytraced (refractive) introduces refractive properties to the material.
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Adjusting the specular component
When creating plastic material in V-Ray, adjusting the specular component is an important step in achieving the desired look for the plastic. The specular layer controls the reflections on the material.
To make the plastic more reflective, increase the specular glossiness. A value of around 0.75 will give a nice glossy finish. Increasing this value will make the plastic look even glossier. On the other hand, decreasing the specular glossiness will give the plastic a more matted appearance.
Specular maps can also be used to dictate where on the material you will see glossy or matte reflections. These can be added to the reflection glossiness slots to create varying levels of gloss across the material. You can use black and white maps, including reflex and bump maps, to achieve the desired effect.
Additionally, the colour of the reflections can be adjusted. Setting the reflection colour to black will result in no reflections, while setting it to white will create very intense reflections. Adjusting the reflection colour can be an effective way to change the appearance of the plastic object.
By manipulating the specular component, you can fine-tune the reflective properties of the plastic material and create the desired visual effect.
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Using VRayFastSSS2
VRayFastSSS2 is a material option in V-Ray that can be used to create translucent plastic. It is a newer, faster interpretation of Subsurface Scattering that is also more adjustable.
To create translucent plastic, the colour mode should be set to Sub-Surface Colour and the Single Scatter set to Raytraced (Solid). The Scatter Coefficient defines the outer refractive layer of the material, while the Fog Colour gives it some colouring. Lighter Scatter Coefficient colour values make the object look more opaque, while darker colours make it look more refractive. Black Fog Colour makes the material fully refractive, but any other dark colour makes it opaque.
The Index of Refraction (IOR) is also important to set correctly. This defines how the material refracts transmitted light. Air has an IOR of 1, meaning it is no obstacle to light transmission. Cosmetics plastic bottles are commonly made of PET, which has an IOR of 1.575. Different plastic IOR values can be experimented with to get the desired look.
The Specular layer controls the reflections or the specular component of the material. Increasing the Specular glossiness makes the material glossier, while decreasing it makes the material look more matted.
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Adding colour tint
Adding a colour tint to plastic in V-Ray involves several steps. Firstly, you need to make the plastic translucent. This can be achieved by changing the Single Scatter parameter to Raytraced (refractive), which introduces refractive properties to the material.
Next, you can adjust the colour tint by changing the Scatter coefficient and Fog colour parameters. The Scatter coefficient defines the outer refractive layer of the material, and lighter values will make the object look more opaque, while darker colours make it look more refractive. The Fog colour gives the object a tint, and a black fog colour will make the material fully refractive.
For example, to make a plastic bottle look green, you can set the Scatter coefficient to a light green and the Fog colour to a dark green with a yellow tint. This will give the bottle some density.
You can also add a black emissive layer with a coloured transparency to change the colour of the material. Additionally, when working with translucent materials, there is no need to change the Diffuse or Overall colour, as the material has no diffuse colour, and the Overall colour parameter is used as a filter.
When applying a colour tint, it is recommended to test the tint on scrap or surplus clear plastic parts first to determine the desired shade and ensure adherence. The tint can then be applied using transparent paints, dyes, or tinting films. If using paints or dyes, it is important to allow sufficient drying time, as per the manufacturer's instructions.
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Setting the right IOR
When creating plastic materials in V-Ray, the IOR values can vary depending on the specific type of plastic. For example, the IOR for PET, commonly used in cosmetic plastic bottles, is 1.575. For a more generic representation of plastic, the IOR range is typically between 1.45 and 2.4. This range accounts for the different types of plastics with varying refractive indices.
To create a shiny, glossy plastic effect, a higher Glossiness value is required, typically between 0.95 and 0.99. Conversely, for a matte or diffused look, the Glossiness value should be lowered to the 0.6-0.7 range. Adjusting the glossiness will affect the sharpness of the reflections on the plastic surface.
It is worth noting that the IOR values can be further refined for more intricate details. For instance, the thin film IOR parameter in V-Ray materials can be adjusted to create iridescent effects. Additionally, the Fresnel IOR is linked to the IOR in V-Ray, as they both influence the material's reflections and refractions.
By understanding the impact of IOR on light transmission and the specific IOR values associated with different plastics, you can create realistic and visually appealing plastic materials in V-Ray. Experimentation with different IOR values is encouraged to achieve the desired aesthetic for your plastic renderings.
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Frequently asked questions
You can create plastic material in VRay by downloading pre-made plastic materials from sites like CadNav, ARHIGREG DESIGN, and Arhigreg.
You can open the 3D model in the version of 3ds Max 2014 + VRay (version 2.40.04) or higher.
You can download the single archive with all 24 VRay materials, or download each material separately, or download all VRay materials in a separate file.
No, all VRay materials from the collection ARHIGREG DESIGN are free and are intended for personal use and self-education.
To make translucent plastic in VRay, you can use VRayFastSSS2 with V-Ray for 3ds Max. First, make the material translucent, then introduce a colour tint. Adjust the specular component of the material and finish the plastic look by adjusting a few key options.
