Using a 3D design file and receive “All the images must be on the same plane” message whenusing the Combine Image tool.
Double click on the raster image name in Raster Manager. This will bring up an ElementInformation box. Under Geometry > Origin compare the Z value of the rasterimages being used. The Z value must be the same on all of your raster imagesthat are being used in Combine Image tool.
If the Z value is 0.0000 on one raster image and the Z value is 0.5000 on theother raster image then you will get the error message. Change the Z value onthe one that is 0.5000 to 0.0000 and try it again.In 3D dgn files the Z elevation manages the display order.