- Select Elevs command has replace/add/subtract option handled by separate "Integrate Selection" dialog box.
- Select Visible and Select Lit commands implemented. These select the heightfield pixels that are, respectively, visible to the camera or lit by the light source. They also use the new Integrate Selection dialog to offer replace/add/subtraction of the previous selmask in a standard manner.
- Default long operation behavior is to enable interruption via the Esc key. Policy is to not have any long operation require running uninterrupted; if the program crashes when the Esc key is used, it's not a fix to set the "don't allow interruptions" flag for that operation.
Select Visible is handy in that it can help produce heightfields optimized for a static scene where the camera (even if it can rotate) is in a fixed position. After selecting the visible parts of the heightfield, you can invert it to select the invisible pixels, then flatten them. The resulting HF will RLE compress much better and/or produce optimized meshes better. Inverting Select Lit will select shadows.