VS3D / VScad3 User's Guide

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Part 10 - Sculpting From A Sketch - continued.
For this tour, all values in this dialog will be left to their default settings, except for the last two "Map Brightness to Height" fields. All the fields of this dialog are explained below. Many of these same fields apply to other data import functions.

The first field in the "Import Pixel Image as Surface Height" dialog determines which layer to insert the height values on. Had the imported image been a color image, this field would have choices for controlling how the Red, Green, and Blue brightness bands in the image are inserted on what layer(s). Since this is a gray-scale image, the only choice is what layer to insert the height values on.

The "Insert Mode" setting determines how imported surface heights are assigned to the existing sculpture grid:
"Load" mode - The entire sculpture grid (all layers) is replaced by the imported data. This is similar to loading a sculpture ".vs3" file (from the "File / Load Relief" menu).
"Overwrite" mode - The imported data overwrites the current sculpture grid only within the XY coverage extents of the imported data, and only on the layer(s) specified.
"Merge" mode - Similar to "Overwrite" mode, except that the imported data heights are added to the existing sculpture grid heights.

The "Sizing" field determines how image pixels are mapped to sculpture grid points. The default setting is "One Pixel per Grid Point". The other choice is "Resize to Fit", which causes the image to be re-sampled to the current sculpture grid dimensions. The "Sizing" setting has no effect when the Insert Mode is set to "Load".

The Image Sampling value determines if the image is sub-sampled before conversion to surface heights. Normally, this should be 100% (full image resolution). But in cases where the imported image is extremely large, or when it is desired to merge it onto a smaller portion of the sculpture grid, then set the sampling rate at less than 100%.

The "Horizontal Justification" and "Vertical Justification" settings determine where the imported data is merged with, or overwritten on, the existing sculpture grid. These settings only have effect when the Insert Mode is set to "Overwrite" or "Merge". In addition, the justification settings only apply when the "Sizing" mode is "One Pixel per Grid Point".

The "Flip Image Vertically" field determines if the image is flipped top-to-bottom before inserting.

Set the "Map Minimum Brightness to Height" field to 1. Set the "Map Maximum Brightness to Height" field to 0. These two fields determine how the image brightness levels are mapped to actual sculpture grid Z heights. Note that in this tour, you are setting the minimum image brightness (dark lines) to a surface height of 1, and the maximum image brightness (white background) to a surface height of 0.

Click on "Ok". The sculpture grid now shows the lines from the image as thin raised ridges with a heights of up to 1 (above a background plane with a height of 0).

Select the "Edit / Work Layer..." menu, and set the current work layer to 2.

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