Overlay documents enable you to render a flat image inside your 3D scene. It has been designed as a tool to help you create your 3D objects while following some guide lines on an image.

Creating an overlay

Create a new overlay document, drag it in the current scene, and double-click on the document to open it's view.

In the image section, select your image file (supported formats are jpeg, png and tif). It will appear in the overlay view window, as well as in your viewport.

Rendering options for the overlay

You can choose the opacity for your overlay rendering, 0.0 being fully transparent ( you can't see the overlay ), 1.0 fully opaque ( you cannot see any 3D object behind the overlay ).

The paint on ground option will paint the overlay image on the 3D meshes (landscape, buildings...). If unchecked, the overlay will be displayed "flat" as a floating custom shape.

Fitting algorithm for overlay maps

The overlay can be positionned in the scene like any other documents using the translation, rotation and scale gizmos. However, if your overlay is a form of map and you need to place it precesily to fit other geolocalised data in NDunes, using the gizmos can be difficult. This is why you can use our fitting algorithm.

You must create fitting points that will indicate the correlation between a point in the image, and a curve point in the 3D scene. To compute the fitting, you need at least 3 fitting points, but the more you create, the most precise your fitting will be.

For each point the process will be :

Once you have created and completed at least 3 fitting points, you can click on "Compute fitting" and your overlay will be placed automatically. Make sure your overlay is in the current scene.