Nacha Studio / Making of the skin & eye for ‘ZDAY-USA Soldier’
Hello guys! We are Nacha studio. Nacha Studio was found in 2016 in Chengdu China.
We see high-quality as our golden rule and devoting to build our company to become one of the top digital services company worldwide. We are going to explain our process behind the making of our project 'ZDAY-USA Soldier'.
For the head model, we used a basic model that we built in our company that already has UVs.
First of all, you have to create a simple displacement map using an XYZ displacement maps and simply apply this displacement map onto the model inside of Zbrush. This is to get an idea of the sculptover we have to do. If you don't know yet how to make and apply a displacement map, you can read this article: Discover: Surface displacement maps
After that, in Zbrush under the displacement map menu, we set a hotkey 'Q' for the 'Disp on' switch. So we can just press hotkey 'Q' to switch the displacement map on and off.
The reason why we use a temporary displacement map on the model as preview:
Break the highlights to view the shape and adjust it more efficiently.
We can focus more on the sculpt, even the 'smooth brush' won't modify the high-frequency details.
Match the shape according to the details on the displacement map.
When the model is almost complete, we are ready to jump onto the next stage to make the final displacement using the XYZ maps.
Part2. XYZ displacement texture
Now we can finally use the XYZ textures to make the final and polished displacement map with Mari.
*We only used the R-displacement texture. We Suggest use RGB mix channel and will be a better result.
We use ‘Vray Al Surface’ shader and render in V-ray.
When we start to render, we used the following parameters as a starting point.
We tweaked the following parameters inred, other properties are the ones set by default.
At the beginning of the render tests step, we keep the default parameters as much as possible.
Then for the lighting, we use some light presets from our library or recreate new lights from scratch.
Import textures you exported from Mari/Zbrush and try again.
*If you don't have rendering experience about skin shader. We suggest importing the textures one by one to test everything each time. Slowly but surely to check all aspects of your shader.
The following images are our textures and production process preview.
For the colorSpace: Set all scalar (luminance based) Textures to ‘Raw’.
The ‘diffuse color map’ as well as other color maps are set to 'Srgb'.
The following images are our final nodes and shader parameters in the end.
Just like the 'Color Space' we mentioned, these textures are in 'RAW/linear' view on thumbnails preview.
The ‘Remap Hsv’ node is used to adjust the texture slightly and achieve the look we want for the final images.
The 'Luminance' node is used to convert RGB to luminance values. You can also use this node before the displacement node.
The 'Reflection 1 Roughness 0.077' and 'Reflection 2 Roughness 0.026' Is the parameter from the 'RemapHsv' node. Just a slight adjustment, please refer to the above 'textures and Production process' for the final textures look.
*Change The ‘Reflection Distribution’ and ‘SSS mode’ to ‘Diffusion’ or ‘Directional’ based on the results you want to get. There is a more detailed explanation of the SSS in Vray here: VRayAlSurface
Part4. Making of the eye
We just want the eyes to have a natural look, but this is may not be physically accurate.