OneRay-ST includes the great Photo Insertion feature. Here is how to Render your Spiral Stair as Object into a Photograph.
Step by step instructions:
1. Launch OneRay-RT and click on Settings.
2. Set your Spiral Stair Parameters. Then click Ok.
3. Add materials to your Spiral Stair.
4. Select Rendering, then Background to add a background image to your Spiral Stair.
5. Select your image, then click Open. The background image is loaded into your Project.
6. Move and rotate your Spiral Stair to perfectly fit it in the photo.
7. Click on RayTrace Global Illumination Rendering icon to carry out your perfect Rendering of your scene.