# LoadPixelMatrix

> Setup a matrix for pixel-correct rendering.

## Definition

* **Type:** Method
* **Namespace:** [UnityEngine](/engine/6000.0/script-reference/unityengine.md)
* **Assembly:** UnityEngine.CoreModule

## LoadPixelMatrix()

Setup a matrix for pixel-correct rendering.

```csharp
public static void LoadPixelMatrix()
```

### Remarks

Loads an orthographic projection into the projection matrix and loads an identity into the model and view matrices. The projection matrix is such that the X and Y coordinates map directly to pixels. The coordinate (0,0) is at the bottom left corner of current camera's viewport. The Z coordinates go from 1 at the near plane to -100 at the far plane.

Changing the model, view or projection matrices overrides the current rendering matrices. It is good practice to save and restore these matrices using [GL.PushMatrix](/engine/6000.0/script-reference/unityengine/gl/pushmatrix.md) and [GL.PopMatrix](/engine/6000.0/script-reference/unityengine/gl/popmatrix.md).

### Examples

```csharp
using UnityEngine;

public class Example : MonoBehaviour
{
    // Draws a red triangle using pixels as coordinates to paint on.
    Material mat;

    void OnPostRender()
    {
        if (!mat)
        {
            Debug.LogError("Please Assign a material on the inspector");
            return;
        }
        GL.PushMatrix();
        mat.SetPass(0);
        GL.LoadPixelMatrix();

        GL.Begin(GL.TRIANGLES);
        GL.Color(Color.red);
        GL.Vertex3(0, 0, 0);
        GL.Vertex3(0, Screen.height / 2, 0);
        GL.Vertex3(Screen.width / 2, Screen.height / 2, 0);
        GL.End();

        GL.PopMatrix();
    }
}
```

## LoadPixelMatrix(float, float, float, float)

Setup a matrix for pixel-correct rendering.

```csharp
public static void LoadPixelMatrix(float left, float right, float bottom, float top)
```

### Parameters

**** (\[float]\(https\://learn.microsoft.com/dotnet/api/system.single)): **** (\[float]\(https\://learn.microsoft.com/dotnet/api/system.single)): **** (\[float]\(https\://learn.microsoft.com/dotnet/api/system.single)): **** (\[float]\(https\://learn.microsoft.com/dotnet/api/system.single)): 

### Remarks

Loads an orthographic projection into the projection matrix and loads an identity into the model and view matrices. The projection matrix is such that the X and Y coordinates map directly to pixels. The (left,bottom) is at the bottom left corner of current camera's viewport; and (top,right) is at the top right corner of current camera's viewport. The Z coordinates go from 1 at the near plane to -1 at the far plane.

Changing the model, view or projection matrices overrides the current rendering matrices. It is good practice to save and restore these matrices using [GL.PushMatrix](/engine/6000.0/script-reference/unityengine/gl/pushmatrix.md) and [GL.PopMatrix](/engine/6000.0/script-reference/unityengine/gl/popmatrix.md).