7.   Depth

1.  Point the cursor on "Depth" icon. By pressing on red sign you will forbid changing the depth channel while drawing. By choosing the "hill" icon, you will allow editing in the depth channel, however no extra texture will be allowed for overlay in the channel. The question-marked folder means that an extra depth channel texture used for overlay while drawing has not been selected. If the texture is selected, the question-marked folder is changed with a texture-imbued square.  Press on the folder to replace your texture:

2.  "Additive drawing" option allows activating/deactivating additive application option when drawing lines. If "Additive drawing" is active, two lines are drawn one over another. Notably, if the option is disabled, cross is made with objects drawn in the current layer only.

3.  Red line on the pen cursor displays the depth of relief lying. Press "-" and "+" keys or mouse wheel (under corresponding adjustments in the "Options" menu) to see how the depth changes.

4.  If the pen is of complex shape, less pressure should be applied to prevent steep overfalls of image height. On a side note, it would make it hard to present the entire object as normal-mapped low polygonal one, heavy geometry distortions will be seen.

5.  With the help of "Smoothing" slider you can change the level of smoothing. By pressing "Shift" key green line will appear on the pen cursor and by pressing "Shift" + "+" and "-" keys or mouse wheel (provided corresponding adjustments have been made in the "Options" menu) you can adjust the level of smoothing.

6.  Pay attention, on the right panel there are inscriptions "Depth", Color", "Specular". Point the mouse cursor onto one of them. You will see the menu as follows:

depending whether the material was selected.

 

7.  Pressing on a red sign (the first in the list on the right) you will forbid changing the correspondent channel when drawing, be it depth, diffuse or specular. By choosing the second icon in the list on the right (image of "hill" or "sphere", changes depending what channel you work in), you will enable editing in correspondent channel, however without overlaying additional texture in this channel. You will draw with a pen not distorted by material. The question-marked folder icon means that additional texture in corresponding channel, used for overlay when drawing, was not chosen. If the texture is chosen, the question-marked folder changes to a square with a texture of depth, color or specular (depending on channel you work in). Try choosing the ''hill'' icon in depth channel and draw a bit, then opt for square with texture and draw. The difference will be obvious.

- To quick-access such a menu press ''D'' (depth menu), ''C'' (color menu), ''R'' (specular menu). Use "~" key to quick-access the semi-transparent panel containing parameters for all the three channels in compact form.

- The "Folder" icon allows you to set another texture in corresponding channel for the current material. If you set the texture for diffuse channel, bear in mind that the texture alpha-channel is used as additional mask when laying color.

 

8.  You can see the power of the “depth” as the picture shown below: