Adding FadeIn Effect (Fixes #112)

Author: James Brundage

Effects/FadeIn.OBS.FX.ps1

@@ -0,0 +1,40 @@
+<#
+.SYNOPSIS
+    Fades in
+.DESCRIPTION
+    Fades an input by animating an input's opacity.
+#>
+param(
+# The name of the input
+[string]
+$InputName,
+
+# The duration (by default, one second)
+[timespan]
+$Duration = "00:00:01"
+)
+
+if (-not $InputName -and $this -and $this.InputName) {
+    $InputName = $this.InputName
+}
+
+if (-not $InputName -and $this -and $this.SourceName) {
+    $InputName = $this.SourceName
+}
+
+if (-not $InputName) { return }
+
+$addedFilter = Add-OBSColorFilter -FilterName "FadeIn" -SourceName $InputName
+
+# We want to have roughly two steps per frame
+$StepCount = [Math]::Ceiling($Duration.TotalMilliseconds / ([timespan]::fromSeconds(1/30).TotalMilliseconds)) * 2
+
+$stepSleep  = $Duration.TotalMilliseconds / $StepCount
+
+$opacity = 0
+$stepOpacity = [double]1/$StepCount
+@(foreach ($stepNum in 1..$StepCount) {
+    $opacity += $stepOpacity
+    Set-OBSColorFilter -FilterName "FadeIn" -SourceName $InputName -Opacity $opacity -PassThru
+    Send-OBSSleep -SleepMillis $stepSleep -PassThru
+})