forked from BilalY/Rasagar
37 lines
3.0 KiB
Markdown
37 lines
3.0 KiB
Markdown
# Velocity from Direction & Speed (Tangent)
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Menu Path : **Velocity > [Set/Add] Velocity from Direction & Speed (Tangent)**
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The **Velocity from Direction And Speed (Tangent)** Block calculates a velocity for the particle based on a blend ratio between the direction attribute and a tangent vector.
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The tangent vector is based on the particle's current direction and a given axis. The vector is perpendicular to this axis.
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The Block then scales the final direction vector by a speed, and composes it with the velocity attribute.
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Example.gif)
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## Block compatibility
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This Block is compatible with the following Contexts:
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- [Initialize](Context-Initialize.md)
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- [Update](Context-Update.md)
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## Block settings
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| **Setting** | **Type** | **Description** |
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| --------------- | -------- | ------------------------------------------------------------ |
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| **Composition** | Enum | **(Inspector)** Specifies how this Block composes the velocity attribute. The options are:<br/>• **Set**: Overwrites the velocity attribute with the new value.<br/>• **Add**: Adds the new value to the velocity attribute value.<br/>• **Multiply**: Multiplies the velocity attribute value by the new value.<br/>• **Blend**: Interpolates between the velocity attribute value and the new value. You can specify the blend factor between 0 and 1. |
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| **Speed Mode** | Enum | Specifies how to calculate the speed. The options are:<br/>• **Constant**: Applies a constant speed which you set in the **Speed** property.<br/>• **Random**: Applies a random speed between **Min Speed** and **Max** **Speed**. |
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## Block properties
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| **Input** | **Type** | **Description** |
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| ------------------- | -------------------- | ------------------------------------------------------------ |
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| **Axis** | [Line](Type-Line.md) | The line this Block uses to calculate the tangent vector. |
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| **Speed** | float | The speed multiplier to apply to the direction vector in order to calculate the velocity.<br/>This property only appears if you set **Speed Mode** to **Constant**. |
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| **Min Speed** | float | The minimum speed multiplier to apply to the direction vector in order to calculate the velocity.<br/>This property only appears if you set **Speed Mode** to **Random**. |
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| **Max Speed** | float | The maximum speed multiplier to apply to the direction vector in order to calculate the velocity.<br/>This property only appears if you set **Speed Mode** to **Random**. |
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| **Blend Direction** | float | The blend percentage between the current direction attribute value and the newly calculated direction value. |
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| **Blend Velocity** | float | The blend percentage between the current direction attribute value and the newly calculated direction value.<br/>This property only appears if you set **Composition** to **Blend**. |
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