Merge pull request #6394 from Goober5000/fix_camera_shudder

fix camera shudder

code/parse/sexp.cpp

@@ -41301,7 +41301,7 @@ SCP_vector<sexp_help_struct> Sexp_help = {
 	},
 
 	{ OP_SET_CAMERA_SHUDDER, "set-camera-shudder\r\n"
-		"\tCauses the camera to shudder.  Currently this will only work if the camera is showing the player's viewpoint (i.e. the HUD).\r\n\r\n"
+		"\tCauses the camera to shudder.  Normally this will only work if the camera is showing the player's viewpoint (i.e. the HUD), unless the Everywhere flag is set.\r\n\r\n"
 		"Takes 2 to 4 arguments...\r\n"
 		"\t1: Time (in milliseconds)\r\n"
 		"\t2: Intensity.  For comparison, the Maxim has an intensity of 1440.\r\n"

freespace2/freespace.cpp

@@ -3424,7 +3424,6 @@ void game_render_frame( camid cid, const vec3d* offset, const matrix* rot_offset
 	g3_start_frame(game_zbuffer);
 
 	camera *cam = cid.getCamera();
-	matrix eye_no_jitter = vmd_identity_matrix;
 
 	if(cam != nullptr)
 	{
@@ -3445,10 +3444,13 @@ void game_render_frame( camid cid, const vec3d* offset, const matrix* rot_offset
 		}
 
 		//Handle jitter if not cutscene camera
-		eye_no_jitter = eye_orient;
 		if( !(Viewer_mode & VM_FREECAMERA) ) {
 			apply_view_shake(&eye_orient);
-			cam->set_rotation(&eye_orient);
+			cam->set_rotation(&eye_orient);		// this was added in 57fbb21c; see Mantis 1743; needed to make the target indicator shake
+		}
+		//If cutscene camera, handle jitter differently
+		else if ( Game_shudder_everywhere ) {
+			apply_view_shake(&eye_orient);		// the camera rotation shouldn't be modified for cutscenes or it will produce feedback
 		}
 
 		//Maybe override FOV from SEXP