Outline effect unity

You will learn to write a screen space shader to draw outlines around objects. This shader will be integrated with Unity's post-processing stack.

Rendering outlines is a technique that is often used in games either for aesthetic reasons or for supporting gameplay by using it for highlights and selections around an object. For example in the game Sable, outlines are used to create a comic-book-like style. In The Last of Us, outlines are used to highlight enemies when the player goes into stealth mode. However, when using it for rendering outlines, this physical meaning of the effect is not important. The following formula is used to form the outline.

Outline effect unity

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We're still working in object space so again, outline effect unity outline isn't a perfect equal-width outline. A third method to render an outline is by using something that I call a blurred buffer. To implement this we will need the normal of each surface, and the direction from the camera to the surface the view direction.

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In this tutorial, we are going to create an outline effect for basic meshes using Shader Graph in Unity3D. We will encounter some restrictions of Shader Graph and learn how we can overcome this kind of restrictions. At the end of the tutorial, we are going to obtain the following effect:. In order to create an outline for an object, we render an additional image with the same geometry and scale it a little bit to obtain the outline. Nevertheless, we also need to prevent to render the pixels of the newly created image when both images overlap.

Outline effect unity

Rendering outlines is a technique that is often used in games either for aesthetic reasons or for supporting gameplay by using it for highlights and selections around an object. For example in the game Sable, outlines are used to create a comic-book-like style. In The Last of Us, outlines are used to highlight enemies when the player goes into stealth mode. However, when using it for rendering outlines, this physical meaning of the effect is not important. The following formula is used to form the outline. Then, this gets exponentiated with a power P P P. It is important to note that this is only an approximation of the fresnel effect, but it works well for our outlines. For this approach, the objects that need to have an outline get rendered using a custom shader. This shader implements the fresnel effect and allows us to set the width, power, softness and color of the outline. The technique produces an outline that is always an inner line and is not visible outside of the object and so maybe shouldn't even be called an outline.

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View-space normals of the scene. This matrix is not available by default to screen space shaders; we will calculate it in our C script and pass it into our shader from there. Since we're working in clip space, the outline is equal-width, extending the same amount visually around the object. We'll copy this shader over, and then make some modifications. We will construct a variable called normalThreshold , and multiply depthThreshold by it. Vertical blur. We can now calculate the view direction in view space. At the end, we will combine the results of the two for maximum edge coverage. Two cubes a meter apart that are near the camera will have a much larger edgeDepth between them than two cubes that are very far from the camera. Disabling anti-aliasing and pairing with a dither overlay can output a retro look similar to Return of the Obra Dinn. Some modulation has to be done to get rid of these artifacts. This has resolved the issue with the background cubes, but also has created more surface artifacts. As well, some functionality, such as texture sampling, is now handled by macros. For a more complex model, you will have the issue of getting lots of uneven line widths, although the overall outline effect can look alright.

You will learn to write a screen space shader to draw outlines around objects. This shader will be integrated with Unity's post-processing stack.

To improve performance, the silhouette buffer can be scaled down before blurring. To fix this, you can normalize the vector along which the movement occurs. One side-effect is that there will be absolutely no inner lines on the inside of the object and if two objects overlap, the outline will also only be visible around those 2 objects. Note that existing code that is modified will be highlighted in yellow. It is important to note that this is only an approximation of the fresnel effect, but it works well for our outlines. We will now repeat the previous process, except this time using the normals buffer instead of depth. Other modulation techniques can be used, depending on the visual fidelity you want to achieve but these depend on the specific effect that you're after. Since we are working in a 2D space now, only the x and y coordinates of the vertex positions get altered. Horizontal blur. Characteristic for this approach is that it works well for objects like spheres and capsules with smooth and round edges, but it breaks down for objects like cubes or more complex models that have sharp edges. For a sphere, all of the vertices have the same distance from the center point of the object and so they all get moved an equal amount. We can now calculate the view direction in view space. As well, many edges such as those along the staircase were not detected, as the edgeDepth values between steps was too small.