Autodesk 12812-051462-9011 User Guide 3 - Page 952

You can pick, add, or remove illumination through objects. For example, if you select the floor as an object, you can work under the bookshelf, by working through it. Once in light painting mode, you can't select another object unless you cancel the operation. Interface Intensity Specifies the intensity of the illumination in lux or candelas depending on the units you have selected in the Customize > Units Setup dialog on page 7809. Pressure Specifies the percentage of the sampled energy to be used when you add or remove illumination. Add Illumination Adds illumination starting at the vertex of a selected object. 3ds Max adds illumination based on the amount in the Pressure spinner. The pressure amount corresponds to a percentage of the sampled energy. For example, if a wall has about 2,000 lux on it, Add Illumination adds 200 lux to the surface of the selected object. Remove Illumination Removes illumination starting at the vertex of a selected object. 3ds Max removes illumination based on the amount in the Pressure spinner. The pressure amount corresponds to a percentage of the sampled energy. For example, if a wall has about 2,000 lux on it, Remove Illumination removes 200 lux from the surface of the selected object. Pick Illumination Samples the amount of illumination from a surface that you select. To save you from inadvertently making bright or dark spots, Pick Illumination uses an amount of illumination relative to the surface illumination you sample. Click the button, and move the eyedropper cursor over the surface. When you click a surface, the amount of illumination in lux or candelas is reflected in the Intensity spinner. For example, if you used Pick Illumination over a wall that has 6 lux of energy, then 0.6 lux displays in the Default Scanline Renderer Controls | 6207