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 # SetSourceRatioByName 

 Last update: 17.07.2025 

## Description

Sets the power of a source by defining a ratio and using its name.

Returns 1 if the call has succeeded, 0 otherwise.

## Syntax

*object*.SetSourceRatioByName(BSTR *strLayerName*, double *dRatio*) As Int

- *object*: Virtual Reality Lab object
- *strLayerName*: string for the name of the source from the Virtual Lighting Controller
- *dRatio*: ratio defining the power of the source (%)

## Example

```
Sub SetSourceRatioByName()
'Error Management
Dim Error As Integer
'Declare VRLab
Dim VirtualRealityLab As Object
Set VirtualRealityLab = CreateObject("HDRIViewer.Application")
'Show VRLab
Error = VirtualRealityLab.Show(True)
'Open File
Error = VirtualRealityLab.OpenFile("U:\AMT\API VRLab\InteriorCar.speos360")
'Set Luminance Max
Error = VirtualRealityLab.SetLuminanceMax(100)
MsgBox ("Before Source Ratio Set")
'Set the Power of the Source "RedGuide" to half its initial power
Error = VirtualRealityLab.SetSourceRatioByName("RedGuide", 50)
MsgBox ("After Source Ratio Set")
End Sub


```