diff --git a/code/renderer/srp_im3d.cpp b/code/renderer/srp_im3d.cpp
index 24d7c03..56bc725 100644
--- a/code/renderer/srp_im3d.cpp
+++ b/code/renderer/srp_im3d.cpp
@@ -222,6 +222,11 @@ void Im3D::BeginFrame()
 
 void Im3D::Draw(const drawSceneViewCommand_t& cmd, HTexture colorTarget, HTexture depthTarget)
 {
+	if(cmd.viewParms.isPortal || !IsViewportFullscreen(cmd.viewParms))
+	{
+		return;
+	}
+
 #if 0 // cpm3 test/demo code
 	{
 		static Im3d::Vec3 translation(700, 50, -50);