59 lines
2.4 KiB
Markdown
59 lines
2.4 KiB
Markdown
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# Matrix Construction Node
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## Description
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Constructs square matrices from the four input vectors **M0**, **M1**, **M2** and **M3**. This node can be used to generate matrices of types **Matrix 2x2**, **Matrix 3x3** and **Matrix 4x4**.
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The dropdown on the node can be used to select whether the inputs values specify the matrix rows or columns.
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* **Row** : Input vectors specify matrix rows from top to bottom.
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* **Column** : Input vectors specify matrix columns from left to right.
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Matrix outputs are taken from the top left corner of the construction of the inputs. This can be used to generate different dimension square matrices from different dimension vectors.
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For example, connecting **Vector 2** type values to inputs **M0** and **M1** will generate the desired matrix from the output **2x2**.
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## Ports
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| Name | Direction | Type | Description |
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|:------------ |:-------------|:-----|:---|
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| M0 | Input | Vector 4 | First row or column |
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| M1 | Input | Vector 4 | Second row or column |
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| M2 | Input | Vector 4 | Third row or column |
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| M3 | Input | Vector 4 | Fourth row or column |
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| 4x4 | Output | Matrix 4x4 | Output as Matrix 4x4 |
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| 3x3 | Output | Matrix 3x3 | Output as Matrix 3x3 |
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| 2x2 | Output | Matrix 2x2 | Output as Matrix 2x2 |
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## Controls
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| Name | Type | Options | Description |
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|:------------ |:-------------|:-----|:---|
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| | Dropdown | Row, Column | Selects how the output matrix should be filled |
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## Generated Code Example
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The following example code represents one possible outcome of this node per mode.
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**Row**
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```
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void Unity_MatrixConstruction_Row_float(float4 M0, float4 M1, float4 M2, float3 M3, out float4x4 Out4x4, out float3x3 Out3x3, out float2x2 Out2x2)
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{
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Out4x4 = float4x4(M0.x, M0.y, M0.z, M0.w, M1.x, M1.y, M1.z, M1.w, M2.x, M2.y, M2.z, M2.w, M3.x, M3.y, M3.z, M3.w);
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Out3x3 = float3x3(M0.x, M0.y, M0.z, M1.x, M1.y, M1.z, M2.x, M2.y, M2.z);
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Out2x2 = float2x2(M0.x, M0.y, M1.x, M1.y);
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}
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```
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**Column**
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```
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void Unity_MatrixConstruction_Column_float(float4 M0, float4 M1, float4 M2, float3 M3, out float4x4 Out4x4, out float3x3 Out3x3, out float2x2 Out2x2)
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{
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Out4x4 = float4x4(M0.x, M1.x, M2.x, M3.x, M0.y, M1.y, M2.y, M3.y, M0.z, M1.z, M2.z, M3.z, M0.w, M1.w, M2.w, M3.w);
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Out3x3 = float3x3(M0.x, M1.x, M2.x, M0.y, M1.y, M2.y, M0.z, M1.z, M2.z);
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Out2x2 = float2x2(M0.x, M1.x, M0.y, M1.y);
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}
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```
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