**Toony Colors Pro 2** **Shader Generator 2 Beta - Tutorials** v2.4.0 - October 2019 © 2019 Jean Moreno jean.moreno.public+unity@gmail.com -------------------------------------------------------------------------------------------------------------------------------- Shader Generator 2 Tutorials ============================ Here are some tutorials related to the new [Shader Properties](documentation#shaderproperties) system in the Shader Generator 2. They will guide you step by step into recreating some effects, and will allow you to better understand how the system works and how you can customize your shaders further. - [[Use Vertex Colors as Albedo]] - [[Add a detail texture (simple)]] - [[Add a detail texture (advanced)]] - [[Create a hologram shader]] You can see examples of these tutorials in the `Demo TCP2 ShaderGenerator2.unity` scene. If you are looking for the general documentation, you can [find it here](documentation). ##### Quick Tutorials Some quick tips regarding useful features of the new Shader Properties system and how you can easily customize your shaders. Add UV Scrolling to a Texture ============================= On a *`Material Property/Texture`* implementation, in the *UV* section, set *UV Animation* to *`Scrolling`*. *Global* will apply the scrolling values to all textures using the same UV, here *`texcoord0`*. *Variable* allows you to use another texture property's scrolling variable, so that they share their scrolling values (e.g. if you want to scroll a texture and normal map properties synchronously without having to type the same values twice in the material, provided that the Global flag is disabled). ![ ](tutorials_data/quick_uv_scroll.png) Use Non-Repeating Tiling ======================== On a *`Material Property/Texture`* implementation, you can enable the *No Tile* option. This will use a special algorithm to prevent tiled texture repetition. This algorithm was made by Inigo Quilez ([Technique 3](+http://www.iquilezles.org/www/articles/texturerepetition/texturerepetition.htm), MIT License) ![ ](tutorials_data/quick_notile.png) The texture needs to have some randomness to it for the effect to work nicely: ![Regular texture tiling](images/texture_notile_rocks_off.png) ![With "No Tile" enabled](images/texture_notile_rocks_on.png) A texture with a regular pattern won't work so well: ![ ](images/texture_notile_checker_off.png) ![ ](images/texture_notile_checker_on.png) Add Hue/Saturation/Value control to any color ============================================= For any `color` or `color (rgba)` shader property, you can add a `Special/HSV` implementation. This will add hue, saturation and value parameters in the material. !!! INFO Use this option sparingly because converting from RGB to HSV and then back to RGB has a cost in the shader, especially on less powerful platforms like mobile. If possible, you should tweak the color values in the texture file directly, or use the `Saturation Offset` option if it fits your needs, as it is quite fast in comparison. Keep this option in mind when you need to _dynamically_ change these parameters on your material. ![ ](tutorials_data/quick_hsv.png) ![Regular texture](images/texture_hsv_off.png) ![Texture with HSV
tweaked in the shader](images/texture_hsv_on.png) ##### Full Examples Step-by-step tutorials to achieve specific effects. Use Vertex Colors as Albedo =========================== Using vertex colors instead of a texture can save memory on the GPU, and allows you to use the same material for multiple meshes thus making it a good fit for dynamic batching. -------------------------------- 1) Open the Shader Generator 2 through the menu: `Tools > Toony Colors Pro > Shader Generator 2 (beta)` ![ ](tutorials_data/albedo_vcolor_1.png) -------------------------------- 2) Go to the *Shader Properties* tab and expand the *Main Properties* category. ![ ](tutorials_data/albedo_vcolor_2.png) -------------------------------- 3) Expand the *Albedo* property and click on its only implementation *`1. Material Property/Texture`*, to change it to *`Vertex Color`*. ![ ](tutorials_data/albedo_vcolor_3.png) -------------------------------- 4) The property will turn **blue-green**, indicating that its implementation is now different than the default one. This makes it easy for you to track which properties you have changed. !!! INFO The implementations' parameters will also change color if their value is different than the default one. ![ ](tutorials_data/albedo_vcolor_4.gif) -------------------------------- 5) That's it, you can now click on `Generate Shader`. The resulting shader will take the mesh's vertex colors for its albedo, instead of a texture. ![The Albedo texture slot has disappeared from the material inspector,
the mesh will use the vertex color as albedo instead.](tutorials_data/albedo_vcolor_5.png) -------------------------------- Add a detail texture (simple) ============================= This detail texture will just multiply a monochrome texture on top of the base texture. -------------------------------- 1) In the *Albedo* shader property, add a *`Material Property/Texture`* implementation with the *`+`* button. Here the *Swizzle* parameter has been set to *`AAAA`*, so that only the alpha channel of the detail texture will be taken into account. This allows us to import that texture as [single channel](+https://docs.unity3d.com/Manual/TextureTypes.html#SingleChannel) and thus optimize its memory cost. ![A monochrome texture with its own UV tiling values is
multiplied on top of the checker pattern texture.](tutorials_data/tutorial_detail_simple.png) ![ ](tutorials_data/detail_simple_1.png) -------------------------------- Add a detail texture (advanced) =============================== This advanced detail texture will be alpha blended (i.e. linearly blended based on its alpha channel on top of the base texture), and will also work with a normal map with parallax mapping enabled. -------------------------------- 1) We will make this detail texture work with normal maps, so let's enable the required features first: - Surface: - Normal/Bump Map: *`✔`* - Parallax/Height Map: *`✔`* ![ ](tutorials_data/detail_advanced_1.png) -------------------------------- 2) Now in the Shader Properties tab, we will create a custom property for the detail texture. In the *Custom Material Properties* section at the bottom, add a new *`Texture`* property. Let's call it *`Detail Map`*, and rename its variable to *`_DetailTex`*. In the *UV* section, enable *Tiling/Offset* so that you can change these values in the material just for the detail texture. !!! INFO This texture will use `texcoord0` as the input UVs, meaning that it will share the Albedo property's tiling/offset values. This is because by default, the Albedo texture is set to use `texcoord0` as well, with the `Global` parameter enabled, meaning that its tiling/offset values are shared with all other textures using `texcoord0`. Thus the tiling/offset values of the detail texture will be multiplied/added on top of the Albedo tiling/offset values. ![ ](tutorials_data/detail_advanced_2.png) -------------------------------- 3) We will now reference that texture property we just created. In the *Main Properties/Albedo* shader property, add a *`Custom Material Property`* implementation and choose the *`Detail Map`* we just created. ![ ](tutorials_data/detail_advanced_3.png) -------------------------------- 4) By default, the new implementation uses the *`×`* (multiply) operator, but we actually want to alpha blend the texture on top of the base one. We will insert some custom code for that. Add a *`Special/Custom Code`* implementation, and drag it at the top of the implementations list so that it's the first one (using the handle bar at the left). In the code parameter, enter this: ```shader lerp({2}.rgba, {3}.rgba, {3}.a) ``` Here's what this does: - The `lerp` function will linearly interpolate between the first argument and the second based on the third one. - We are referencing other implementations using the {n} notation: - `{2}` refers to the `Material Property/Texture` implementation, which is our base albedo map - `{3}` refers to the `Custom Material Property` which is our detail map In the end, we are interpolating between the base albedo map's colors (`rgba` channels) and the detail map's colors (`rgba` channels) based on the detail map's alpha channel (`a`). !!! INFO You may have noticed that the operator options have been disabled, and show `CC` instead. This is because these implementations are referenced by the custom code node, and their operator will thus be ignored, as the custom code is now responsible for their usage. This also applies to their swizzle, hence why we manually added the `.rgba` and `.a` swizzle in the custom code. ![ ](tutorials_data/detail_advanced_4.png) -------------------------------- 5) Let's do the same for the normal map. Look into the *Normal Mapping/Normal Map* shader property, and add those implementations: - *`Special/Custom Code`* as the first one - *`Material Property/Texture`* which was the original implementation - *`Material Property/Texture`* which will be the detail normal map (make sure to enable the *`Tiling/Offset`* parameter in the *UV* to replicate the values from the `Detail Map`) - *`Custom Material Property`* which will reference the *`Detail Map`* we created earlier (and used in the *Albedo* shader property) The custom code is _almost_ the same as above, except this time we blend between the default `Normal Map Texture` and the new `Detail Normal Map`, still based on the `Detail Map` alpha: ```shader lerp({2}.rgba, {3}.rgba, {4}.a) ``` ![Detail texture with normal map.
Note that because the textures share the `texcoord0` UVs,
the parallax mapping is also applied to the detail textures.](tutorials_data/tutorial_detail_advanced.png) !!! INFO We are linearly blending between two normal maps here, but note that linear blending isn't the most effective way to blend between normals. You can read this article for more detail: [Blending in Detail](+https://blog.selfshadow.com/publications/blending-in-detail/). I will investigate ways to implement more advanced blending, as it would be a bit tricky using only one single line of custom code. ![ ](tutorials_data/detail_advanced_5.png) -------------------------------- Create a hologram shader ======================== We will create a shader to simulate a hologram, thus we will add some emissive color, transparency, scanlines and distortion effects. The end result will look like this (with a bloom post-effect): ![ ](tutorials_data/hologram.mp4) -------------------------------- 1) Enable the needed [features](+documentation#featuresreference):
- Lighting: - Ramp Style: *`No Ramp`* - Emission: *`✔`* - Stylization: - Outline: *`✔`* - Space: *`Clip Space`* - Constant-Size: *`✔`* - Pixel-Perfect: *`✔`* - Transparency/Blending: - Blending: *`Additive`* - Depth pre-pass: *`✔`* - Options: - Disable Vertex Lighting: *`✔`* - One Directional Light: *`✔`* ▪ No ramp prevents the ramp shading calculation, which we don't need since we're going to bypass lighting altogether. Emission will provide unlit colors, as if the hologram was itself made of light. ▪ Outline in clip space with pixel-perfect option will allow to define its width in pixels, regardless of the mesh distance from the camera, to ensure it always stays crisp and visible. ▪ Additive blending will blend the material's pixel by adding its colors with what's behind, again giving the impression that the hologram is made of light. Note that the outline will inherit this blending mode and be additive too. ▪ Depth pre-pass will render the mesh once in the depth buffer before actually drawing it, so that we can't see it through itself (see ["Transparent shader with depth writes" here](+https://docs.unity3d.com/Manual/SL-CullAndDepth.html)): !L[Left: no depth pre-pass, Right: with depth pre-pass](tutorials_data/hologram_depth_prepass.png) ▪ The enabled options (disable vertex lights, one directional light) will ensure that our material has minimal interaction with the scene lights. ![ ](tutorials_data/hologram_1.png) -------------------------------- 2) Go to the [Shader Properties](+documentation#shaderproperties) tab. We will cancel the lighting calculations so that only the emission color is taken into account, and while doing so we will remove all the default material properties that would otherwise show up in the material inspector. For both *Albedo* and *Main Color* in *Main Properties*, replace the default implementations with a *`Constant Value`*, and set their values to *black* (and *alpha to 0*). !!! INFO Not only will this remove the albedo texture and main color from the material inspector, setting a value of (0,0,0,0) will also help the compiler to optimize the resulting code: by knowing that a result will eventually be multiplied by zero, the shader compiler is able to strip out unnecessary calculations in the compiled code. ![ ](tutorials_data/hologram_2.png) -------------------------------- 3) In the *Ramp Shading* section, do the same for all 4 properties:
- Ramp Threshold: `Constant Value` -> 0 - Ramp Smoothing: `Constant Value` -> 0 - Highlight Color: `Constant Value` -> black - Shadow Color: `Constant Value` -> black ![ ](tutorials_data/hologram_3.png) !!! INFO Removing lighting from a lit shader that way isn't the best thing to do, but please note that I do plan to add a proper unlit option eventually. -------------------------------- 4) We will now create a custom property that will control our hologram color. In the *Custom Material Properties* section, add a new *`Color`* property. Name it *`Hologram Color`*, and optionally rename its variable to *`_HologramColor`* if you care about the generated shader code readability. Set a light blue color as the *Default Value*, and optionally enable *HDR Color* (can be useful when using bloom). ![ ](tutorials_data/hologram_4.png) -------------------------------- 5) We will also create a texture property to create a scanlines effect, like in old CRT televisions. Still in the *Custom Material Properties* section, add a new *`Texture`* property. Name it *`Scanlines Texture`* and rename its variable accordingly. We want the scanlines to always be horizontal, no matter the view angle, so we will use screen-aligned UV coordinates. Set the *UV* to *`Screen Space`*, and expand its options: - *Tiling/Offset*: *`✔`* - *Scale by Texel Size*: *`✔`* - this will scale the UVs so that the texture will use its native size regardless of the screen resolution (provided that the XY tiling values stay at 1,1); in the provided example, the scanlines will always be 2 pixels tall. - *UV Animation*: *`Scrolling`* - so that we can scroll the scanline texture upwards to enhance the effect ![ ](tutorials_data/hologram_5.png) -------------------------------- 6) We will now use those custom material properties in our shader. Open the *Outline* group, and in the *`Color (Per-Vertex)`* shader property, replace the default implementation with *`Custom Material Property/Hologram Color`*. This will make the outline color use the hologram color property we defined earlier. ![ ](tutorials_data/hologram_6.png) -------------------------------- 7) Now let's edit the emission color. Open the *Emission* group, and the Emission shader property: - Replace the default *`Material Property/Color`* implementation with a *`Material Property/Texture`*, and rename its variable to *`_MainTex`*. We will use the albedo texture for the emission color. Renaming the variable will allow the material to keep its albedo texture when switching to this hologram shader. - Add a new implementation: *`Custom Material Property/Hologram Color`*, so that the texture gets multiplied with the hologram color we defined earlier. - Add a new implementation: *`Constant Value`*, and set it to a medium gray (0.5, 0.5, 0.5). This will divide the hologram color by two, so that its intensity is half of the outline's color. - Add a new implementation: *`Custom Material Property/Scanlines Texture`*, and set its *Swizzle* to *`AAA`*, so that we only use the alpha channel of the scanlines texture. This is because the scanline texture has been imported as a single-channel texture using the alpha channel only: ![By setting the texture as single channel, its size in memory is up to 4x lower compared to a full RGBA texture. It is good practice to do that whenever possible with monochrome textures.](tutorials_data/hologram_7_scanlines.png) - Finally, add this implementation: *`Special/N·V`*, which will be multiplied with all the rest. It will make the 'inner' parts of the mesh transparent, depending on the view angle. See the [documentation about special implementations](+documentation#shaderproperties/implementationsreference/special/...) for more information.
Enable *`Use Min/Max Properties`* to be able to tweak the effect, and *`Invert`*.
Since we're using an additive blending mode, the black parts of the N·V calculation will effectively mask out the material. ![ ](tutorials_data/hologram_7.png) -------------------------------- 8) We will now create a scanline distortion effect by using the [Custom Code implementation](+documentation#shaderproperties/implementationsreference/special/customcode) with the Vertex Position hook. Open the *Hooks* group, and look for the *Vertex Position (World Space)* shader property. Add a *`Special/Custom Code`* implementation, and set it to this: ```shader + float3(-0.05,0,0) * saturate((0.0333 - (sin(_Time.z - worldPos.y*5)+1)*0.5)*30) ``` Here's what this code does, decomposed from left to right: - `+` : the custom code is appended right after the `worldPos` variable from the hook, so we need to define how it will affect it - `float3(-0.05,0,0) * ` : you can think of this as a mask, so that only the X component of the world vertex position will be slightly altered by the code - `saturate` : this function is equivalent to `clamp(x, 0, 1)`, that is, it will force the value to be within the [0-1] range - `(0.0333 - (sin(_Time.z - worldPos.y*5)+1)*0.5) * 30` : we calculate a steep sine wave, which will give a 'dents' graph because of the saturate function above. You can visualize it on this graphing tool. The `_Time.z` as an offset of the sine function is what makes the effect move. In the end, this code will displace the vertices on their X axis based on their Y position in world space over time. ![ ](tutorials_data/hologram_9.png) -------------------------------- 9) You should end up with this result (here using a bloom post effect and a HDR hologram color). ![ ](tutorials_data/hologram.mp4) -------------------------------- #####   Contact ======= If you have questions, bug reports or suggestions please contact me by email at: jean.moreno.public+unity@gmail.com