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38 lines
2.2 KiB
Markdown
38 lines
2.2 KiB
Markdown
4 years ago
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# Working with Curves
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You can import Alembic files with curve data to Unity, and optionally preview the curves in your Scene and Game views if you don't have a custom curve renderer.
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## Importing Alembic Curve data
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To import an Alembic file with curve data, start the Alembic file [import process](import.md), and then in the [import settings](ref_Importer.md), select **Import Curves**.
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In the hierarchy of the imported Prefab instance, the Alembic importer adds an **Alembic Curves** component to each GameObject that corresponds to an Alembic curve node, in order to manage the curve data that comes from your Alembic file.
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Unity imports the curves as piecewise linear segments, and the imported curve data includes the following attributes:
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* Visibility
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* vertexPositions
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* nVertices
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* width
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* UV
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* Velocities.
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>**Note:** The imported curve data does **not** include the spline information from the original Alembic Curve schema.
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## Rendering Alembic Curves
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Unity does not currently include any built-in curve renderer. This means that, by default, you cannot see the imported curves in the Scene and Game views of your Unity Editor, unless you implemented a custom curve renderer.
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However, the Alembic package provides you with a custom basic rendering feature that makes the curves minimally visible in Unity while you are working on your project.
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>**Note:** You should only use this option as a temporary preview solution, and keep it disabled if you need to produce a final quality render through your own custom curve renderer.
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To enable the basic preview of Alembic curves in Unity, when you configure the [import of Alembic curve data](#importing-alembic-curve-data), also select **Add Curve Renderer**.
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In the hierarchy of the imported Prefab instance, the Alembic importer adds three components to each GameObject that corresponds to an Alembic curve node, in addition to the **Alembic Curves** component:
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* A **Mesh Renderer** component
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* A **Mesh Filter** component
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* An **Alembic Curves Renderer** component, which maps the curve data of the **Alembic Curves** component with the rendered mesh.
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<br />_Example of imported curves with the basic rendering option enabled for preview purposes._
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