70 lines
3.7 KiB
Markdown
70 lines
3.7 KiB
Markdown
# Tangent modes
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You can [select a tangent mode](select-tangent-mode.md) for knots that determines how their tangents are calculated.
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Knots support the following tangent modes:
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* [Linear](#linear-tangent-mode)
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* [Auto](#auto-tangent-mode)
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* [Bezier](#bezier-tangent-mode)
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## Linear tangent mode
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Use the **Linear** tangent mode to create a spline with straight lines or sharp corners.
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The **Linear** tangent mode sets a knot's tangents to a length of `0` so that they point directly at the preceding and following knots.
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In **Linear** mode, tangents are automatically computed and cannot be directly manipulated in the Scene view.
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## Auto tangent mode
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Use the **Auto** mode to create splines with smooth curves.
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The **Auto** tangent mode calculates a knot's tangents based on the positions of its preceding and following knots. When you create a new knot on a spline in **Auto** mode, the preceding knot's segment curve adjusts according to the position of the new knot. If you rotate a knot in **Auto** mode, its tangents do not rotate with it.
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In **Auto** mode, tangents are automatically computed and cannot be directly manipulated in the Scene view.
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> [!NOTE]
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> The **Auto** tangent mode creates Catmull-Rom splines.
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## Bezier tangent mode
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Use the **Bezier** tangent mode to create splines with tangents you can directly manipulate and modify in the Scene view.
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You can select the following **Bezier** modes for knots in the **Bezier** tangent mode:
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* [**Mirrored**](#mirrored-bezier-mode)
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* [**Continuous**](#continuous-bezier-mode)
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* [**Broken**](#broken-bezier-moode)
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### Mirrored Bezier mode
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Set a knot's tangents to point in opposite directions and have equal lengths.
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A knot in **Mirrored** mode always points to its **Out** tangent. If you move tangents in **Mirrored** mode, the parent knot rotates to point to its **Out** tangent. If you rotate a knot in **Mirrored** mode, its tangents rotate with it.
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> [!NOTE]
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> For splines with non-uniform scaling, a knot in **Mirrored** mode might not point to its **Out** tangent. Non-uniform scaling is when the Scale in a Transform has different values for the x-axis, y-axis, and z-axis. For example, a spline with Scale values of (1 , 5, 10) has non-uniform scaling.
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If you select a tangent and set it to **Mirrored** mode, it mirrors the opposite tangent. For example, if you set an Out tangent to **Mirrored**, the In tangent's length and direction change, but the Out tangent's length and direction do not change.
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### Continuous Bezier mode
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Align a knot's tangents so they always point in opposite directions. The length of tangents in **Continuous** mode are independent of each other and you can set them to different values.
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A knot in **Continuous** mode always points to its **Out** tangent. If you move tangents in **Continuous** mode, the parent knot rotates to point to its **Out** tangent. If you rotate a knot in **Continuous** mode, its tangents rotate with it.
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> [!NOTE]
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> For splines with non-uniform scaling, a knot in **Continuous** mode might not point to its **Out** tangent. Non-uniform scaling is when the Scale in a Transform has different values for the x-axis, y-axis, and z-axis. For example, a spline with Scale values of (1 , 5, 10) has non-uniform scaling.
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If you select a tangent and set it to **Continuous** mode, it aligns with the opposite tangent. For example, if you set an Out tangent to **Continuous**, the In tangent's direction changes, but the Out tangent's direction does not change.
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### Broken Bezier mode
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Dissociate a knot's tangents from each other. Use the **Broken** mode to directly manipulate each tangent's length and direction.
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If you rotate a knot in **Broken** mode, its tangents rotate with it.
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