Screen Position Node
Description
Provides access to the screen position of the mesh vertex or fragment. The X and Y values represent the horizontal and vertical positions respectively. Use the Mode dropdown control to select the mode of the output value. The available modes are as follows:
Default - Returns X and Y values that represent the normalized Screen Position. The normalized Screen Position is the Screen Position divided by the clip space position W component. The X and Y value ranges are between 0 and 1 with position
float2(0,0)at the lower left corner of the screen. The Z and W values aren't used in this mode, so they're always 0.Raw - Returns the raw Screen Position values, which are the Screen Position values before the clip space position W component is divided out. Position
float2(0,0)is at the lower left corner of the screen. This mode is useful for projection.Center - Returns X and Y values that represent the normalized Screen Position offset so position
float2(0,0)is at the center of the screen. The range of the X and Y values is –1 to 1. The Z and W values aren't used in this mode, so they're always 0.Tiled - Returns Screen Position offset so position
float2(0,0)is at the center of the screen and tiled usingfrac.
Ports
| Name | Direction | Type | Binding | Description |
|---|---|---|---|---|
| Out | Output | Vector 4 | None | Get the Screen Position of the mesh. |
Controls
| Name | Type | Options | Description |
|---|---|---|---|
| Mode | Dropdown | Default, Raw, Center, Tiled | Select which coordinate space to use for the Screen Position output. |
Generated Code Example
The following code examples represent one possible outcome for each mode.
Default
float4 Out = float4(IN.NDCPosition.xy, 0, 0);
Raw
float4 Out = IN.ScreenPosition;
Center
float4 Out = float4(IN.NDCPosition.xy * 2 - 1, 0, 0);
Tiled
float4 Out = frac(float4((IN.NDCPosition.x * 2 - 1) * _ScreenParams.x / _ScreenParams.y, IN.{0}.y * 2 - 1, 0, 0));