How to Make Realistic Characters in ZBrush and Maya (1)

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In this post, the best render farm Fox Renderfarm will share with you a tutorial about how to make realistic characters in ZBrush and Maya from 3D artist Yi Chen. Yi Chen showed us the workflow of his latest realistic female character. Software used includes ZBrush, Maya, Mari, Substance Painter, Xgen, Arnold, etc. This is part one of the tutorial, part two will be continued.

Introduction

I am a 3D artist. Today I will share the production process on how to create realistic characters. The model is made using Zbrush and Maya; Mari and Substance Painter are used to make textures; Xgen is used to make hairs, and Arnold is used for rendering.

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A Male character:

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Gathering references

Before starting to make the model, I will analyze the concept map and collect a lot of pictures of women. Because this work does not refer to a specific picture, I could combine and match many of your favorite elements, including clothing, hairstyles, makeup, jewelry, etc. Then starting with simple sketching and compositing in Photoshop, it is better to have a concept map at least before production.

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Modeling

I’m used to determining the size and scale of the model before making the model. According to Anatomy, the vertical length of the head of an adult is between 22-24cm, and the diameter of the eyeball is generally between 2.4-2.5cm.

And when making a model in Zbrush, we need to set the focal length of the Zbrush view camera in advance according to the picture material. The most commonly used portrait focal lengths are 85mm, 100mm, 135mm, and 200mm. Some original photographs usually include the specific focal length value of the picture. If it is a reference picture, we can roughly determine the focal length range by observing the leakage range of the front person’s ears. The gif below can be used as a reference basis. Of course, this is only a reference for the focal length of a portrait. If it is half-length or full-length, the focal length will be different.

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To create the model based on the reference material, I directly used Zbrush to sculpt Blocking, and the number of subdivided faces was kept at about 50 million, level 7 so that the flow model used for rendering at the lowest subdivision level can be controlled at about 12,000.

After the model was modified, I continued to use the UV split tool that comes with Zbrush to make the UV, and then manually adjusted it to the appropriate position. Then I used XYZ pore material + Zwrap plane to project the pores, and then projected some undesirable areas in Mari. Next, it was time to output the grayscale images of the three channels of R, G, and B in Mari and extrude the bumps on the surface of the model through Zbrush to get fine pores. In this step, the model used a 16-bit 8K precision texture map.

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Animated Short Film "Survival" Scene Production Analysis
Animated Short Film "Survival" Scene Production Analysis
This time, our render farm brings you an analysis of the animated short film "Survival" scene production. As the leading cloud render farm in the CG industry, Fox Renderfarm has always been committed to providing artists with affordable, reliable and secure cloud rendering services. It also encourages outstanding artists to make good works and promote the production of their works, and let more people know them and their excellent works.This article brings about the production and analysis of the animated short film "Servival" produced by CG artists Li Yicong, Sun Ningning, Xing Luyue, Shi Tao and Li Yongcong. The software used is Maya, Arnold, AE, Nuke and so on. A brief introduction to the short filmThe short film tells that in a city where energy is exhausted after the end of the world, a lonely little robot relies on finding a waste battery in the city every day to live alone, until he finds that the city has no more disposable batteries to use, but he has no choice but to go home. Packing up the luggage, reluctantly pulling his own stroller, leaving the city, embarked on the road to find new energy. The specific production process Previous periodThe script is written by members and then determined through multiple discussions based on the technical level and conditions that can be achieved, and then the character design and scene design by the pre-art.!Animated Short Film Survival Scene Production Analysis - 1 Memories!Animated Short Film Survival Scene Production Analysis - 2 ModelingI found a lot of references during modeling, and I used to make up for a mechanical principle for a while. However, the animated character and mechanical design are not exactly the same. Consider the functions of action binding, emotional expression, and plot. Figure 1 is a partial reference of the character. The mapping is mainly used for Ddo and Mari. Role model!Animated Short Film Survival Scene Production Analysis - 3 Light rendering Scene one!Animated Short Film Survival Scene Production Analysis - 4One of the scenes is the home of the robot, which lives in an abandoned train station. This lens acts as an empty mirror to ease the rhythm and explain the living environment.The robot looked for a day's battery, and the harvest was not much. Because it was far away, it almost lost a life on the way home. The lighting is set in the evening, except that it feels very dull, and it also implies that the small robot has lived in this city for a long time. On the other hand, the evening light effect, the light ratio is strong, the angle between the light, the camera and the object is relatively small, and the surface of the object will produce a beautiful Fresnel reflection. The figure below shows the material properties of the railway.!Animated Short Film Survival Scene Production Analysis - 5Here you can use three or more textures to represent an object, color map, reflection map, and normal map or bump map. If it is close-up, you need to add a roughness map to make the object produce more rich changes.Backlighting also works well for translucent objects, such as the dirty old glass on the bridge, the grass on the ground, and the semi-transparent effect of all the plant leaves on the vine. In addition, the grass adjusts the wind output in SpeedTree and then imports it into Maya for material adjustment. Special plants need to be created in SpeedTree. Add force field to shape the plant into the shape and growth trend that you want, and then export. Creating plants in SpeedTree allows you to export wind animations to Maya, and plants can move to increase the authenticity of the scene.!Animated Short Film Survival Scene Production Analysis - 6SpeedTree Software Plants imported into Maya!Animated Short Film Survival Scene Production Analysis - 7Create a render layer in Maya, put all the objects into the new render layer, and then add the Arnold base material for layer coverage so that the entire scene is the same material and the texture is ignored. Benefits are,First, when lighting, it can be not affected by the texture of the surface of the object. It can observe and adjust the position of the light and shadow well, and use light and shadow to compose and shape the volume of the object.Second, remove the texture, refraction, etc., the test rendering speed is fast, the adjustment can get feedback quickly. Here you can see that this picture is not completely retrograde, the light source is to the left. At the time, when lighting in the scene, I hope that one side of the locomotive can produce a bright surface, and the lower left corner is too bright, so that the light of the whole scene is too average.!Animated Short Film Survival Scene Production Analysis - 8Adjust the lights and start making material adjustments and renderings. If you find that many places need to be adjusted after rendering, you can reduce the sampling of all aspects, in order to save rendering time, after many adjustments to the screen you want, if you want the work more realistic and reduce the rendering time, you can use a Maya render farm.In Arnold, it is generally necessary to separate several layers,!Animated Short Film Survival Scene Production Analysis - 9 Scene 2!Animated Short Film Survival Scene Production Analysis - 10In the home of the small robot, this is a parting scene, where the warm shades of light are used to make a warm and sad feeling, so use the Maya spotlight to simulate the sun's rays, let it produces a light fog to simulate the atmosphere, which can increase the drama and authenticity of the scene. Scene 3!Animated Short Film Survival Scene Production Analysis - 11 Post-production and composite editingThe short film uses Arnold to render a multi-channel synthesis scheme with a total of 13 layers, which is finally synthesized in Nuke and AE.!Animated Short Film Survival Scene Production Analysis - 12 !Animated Short Film Survival Scene Production Analysis - 13
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2019-09-06
How To Rebuild Avatar With Arnold For Maya
How To Rebuild Avatar With Arnold For Maya
In 2009, a sci-fi film Avatar swept the world. This film won a lot of honors, but as a CG enthusiast, the greater fun is still exploring the production process of this film. In Avatar, many characters and scenes are made using Maya. As the leading cloud rendering services provider and render farm, Fox Renderfarm will introduce the Avatar as a case by Arnold and Maya to introduce the software. Part 1. Collection of materials Material collection is an important step, and the more time you spend collecting material, the less late errors will be. When making the Avatar model, I used the web to collect a lot of real material and video reference. You can add some of your own understanding during the production process. You can also try different brush strokes when post-production in ZBrush, and finally unify the whole character. Here are some of the materials I collected. Part 2. Maya basic modelUse Maya's own box as the basic model, first adjust the general proportion, and then start from the large-sized model parts, so that you can grasp the overall feeling of the character in a relatively short time, and easily modify the scale. As far as possible, the wiring should be as clean as possible. It is not necessary to describe too much detail. In particular, pay attention to the structural turning of the head to facilitate engraving later. Step 1: This role, gives me the feeling is a combination of feline and human face, the upper part of the face is a lion, the lower part is a human. I decided to put more effort into her lower half of the face and tried to understand the upper half of the cat's face. After analyzing these things, we can grab some of her characteristics to start modeling. I made a simple model, this time there are very few lines, it is very convenient for you to adjust the feeling. At this time, the proportion and position of the character's lower jaw and facial features were fixed. Step 2: Add one line while adjusting and perform local detail processing. Eye, eyebrow and cheekbones, here are the low mold and final wiring diagram. Part 3. Adding ZBrush DetailsAccording to the previous reference to determine some of the details of the role structure, subdivision in ZBrush, improve the number of faces of the model to add some details to the model. For example, pores, texture of the lips, etc. Step 1: First perform Maya's cleanup to check if there are more than four sides. Export the obj model without problems. Step 2: Import ZBrush to add details. Use a few skin brushes. Detail breakdown and detail addition. Part 4. Mapping the TextureBecause there is already a film and television as a reference, the texture is closer to the content of the film. Here are some of the material I collected. You need to make sure the uv is correct before drawing the texture. I am using the UVLayout plugin to split the model UV. Pay attention to the position of the tangent at the time of splitting, try to put it in the place where it can't be seen, so as to avoid the seam problem. The mapping of the texture here is made by combining Mari and ps. In order to quickly grasp the process of drawing textures using mudbox here. These are the uv splits using plugins. It's worth noting that sometimes splitting out is not ideal and needs to be re-edited in the Mayauv editor. The overlapping parts in the red part of the figure can be adjusted in the uv editor. The final result is as follows. After the UV editing is done, it is necessary to draw the texture and draw it here using the mudbox.Firstly, subdivide the model and then export obj. The second is to open the mudbox and import the model. Select a brush. The shader looks at your personal habits and can switch between viewing highlights and non-highlights. Select the brush and click New Layer on the model to select the map size and format as needed.I am here to choose 4096*4096 size for clarity. And named as the background color, in order to put the background color on the model, to prevent the back when painting the map. The new layer adds the pattern, which can be adjusted in conjunction with the layer blending mode. To achieve the right results. Generate textures and export them after making multiple adjustments. And add textures in ps. And the root layer is created to generate the corresponding 3s highlights and bumps. Part 5. RenderingLight setting: The first step, we basically use the most basic three-point lighting principle to first adjust the intensity of light to achieve the required intensity. Note that this is the arnold renderer that is utilized, so the default light is attenuated with light. The lighting test of the advanced model (the model without the map) pays attention to the contrast of the cool and warm of the light.The three-point lighting is generally the primary light source auxiliary light and contour light, pay attention to the contrast between the main light source and the contour light. There is also an application with skydemo light to simulate the surrounding environment. Setting of the shader ball: In order to better express its texture and skin characteristics, we will use the corresponding skin material.The first step: Since the texture has been drawn before, the respective skin layers whose inherent color is blue are also adjusted according to the inherent color. Connect all the textures to the corresponding properties of the shader and adjust the parameters. Here, five textures are connected to the skin's three-layer highlight and normal map. Then adjust and test the lights. Render channel output: Render the corresponding channel, which is more convenient to adjust later. They are id, normal, highlight, ao, sss, etc. Channel synthesis: The rendered layer is synthesized in ps, the ao channel is synthesized by the method of the film stacking, and the highlight channel is synthesized by the screen method. The normal channel can be synthesized in nuke to re-adjust the light. It is possible to directly adjust the eyelashes and adjust the background lighting effects and color in the ps. Adjust the desired effect with the final adjustment. That's all there is to explain about the making of Avatar, we hope you've been inspired. If you are looking for a render farm, why not try the fast and TPN-accredited render farm, Fox Renderfarm, who offers a $25 trial.
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2019-06-12
Maya 2018 Arnold's Method of Making Motion Vector Blur in AOV Channel
Maya 2018 Arnold's Method of Making Motion Vector Blur in AOV Channel
Yesterday, I found that the Arnold of Maya 2018 has a directional error for the motion vector blur method made in the AOV channel. The motion blur method I wrote earlier applies to Maya 2016 and earlier versions, so I spent a little time studying it today. The problem has been solved now, and cloud rendering will use a small case to explain the production steps. Step 1: Creating the ball as a simple animated scene. Step 2: Turn on motion blur: Render a reference to motion blur. Step 3: Follow the method given in the official Arnold documentation: Change the camera's Shutter Start and Shutter End to 0.5 (why changed to 0.5 because my motion blur type is Center On Frame). Step 4: Create a channel for AOV motion blur: Here I will create two motion blur channels: The first is the motionvector channel that comes with Arnold. The second is to use the custom motion vector AOV of motion vector shader (giving the aiMotionVector material in the AOV channel). Cloud rendering note: MBlur is named according to your preference. The setting of aiMotionVector was wrote in the previous article. Step 5: Render this image to see two motion blur conditions. It can be seen that both the motionvector and MBlur motion blur channels in our AOV channel are in the wrong direction. Step 6: Next I will officially explain how to solve this problem: From the beginning. A: Turn on the Motion Blur button in the render settings: I chose the Center On Frame mode here. B: Change the Shutter Start and Shutter End in the camera Arnold attribute to 0.5, respectively, corresponding to the Center On Frame mode. (Note: When rendering the motion vector AOV, the camera Shutter Start and Shutter End should be the same value.) C: Create a new MBlur_2 channel in AOV (to compare with the previous MBlur.) D: Open the material editor and find the two nodes aiMotionVector and aiVectorMap under Arnold's material panel. 1) Connect the outColor of the aiMotionVector node to the input of the aiVectorMap node. 2) Then connect the outValue in the aiVectorMap node to the DefaultValue in the Shader property of the MBlur channel in AOV. Change the XYZ mode of the Order in the aiVectorMap node to YZX mode and remove the hook of the tangentSpace. 4) In the aiMotionVector node, enable Encoding Raw Vector. E. After the above steps are completed, start rendering the image and view it in Nuke. As shown in the figure: Maya's default motion blur is basically the same as the MBlur_2 channel we made in AOV, and the motion blur adjusted by Nuke is basically the same. Of course, I also found a bug in the Arnold renderer, its motion blur channel does not solve the shadow of motion blur, there can be seen in a big picture that cloud rendering attached below. Fox Renderfarm hopes it will be of some help to you. It is well known that Fox Renderfarm is an excellent CPU&GPU cloud render farm in the CG world, so if you need to find a render farm, why not try Fox Renderfarm, which is offering a free $25 trial for new users? Thanks for reading!
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2018-12-26
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