Troubleshooting SmartCAM Graphics

Technote 229
Date: April 2009
Product: All SmartCAM Applications
Version: v14 and up

Problem:
The problem I am having is:

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Jagged edges on lines at angle

If layer or step lines appear to be jagged or stair-stepped, when they are viewed from a non-parallel or perpendicular angle, it usually means the video card anti-aliasing has been disabled in your display driver.

Anti-aliasing is the display feature that smooths out lines drawn on angles.

This functionality is built into your display card driver and hardware and needs to be enabled in same. Theprocess for doing so varies between Windows versions and display driver manufacturers and versions. In general, youopen the Display Properties control panel or check Control Panel list for a panel by your video card manufacturer.From there, modify the 3D or OpenGL settings and enable Anti-aliasing.

Anti-aliasing often has a scale to adjust how much to use; for example 2X, 4X, 6X, etc. Try to use as lowa value as possible, 2X if you can. Drivers rosewill cameras. Higher values do not smooth out the image that much more, but they do increasethe workload for the video processor, which slows down performance.

Show Path flickers or graphics disappear when Show Path is finished.

If the Show Path graphics flicker while running, or if all the temporary graphics disappear immediately afterShow Path finishes (but the Show Path dialog is still open), then try adjusting the buffer handling.

Your SmartCAMcnc.INI contains a [Setup] section, with a variable named ShowPathDblBuf. ThisINI setting can be set to 0 or 1. 0 means turn off double-buffering, while1 says to enable it.

Initially, set the value to 1, then try Show Path. If it exhibits the same issues, try setting the value to 0.

Then double buffering is enabled (1), there will be a slight performance degradation due to the required buffer swapping.

SmartCAM reads all INI settings on startup, so you will need to close your SmartCAM applications, make your INI changes,and restart to see the results of the INI change. If you do not know where your INI files reside, seeTechnical Bulletin 244: How Do I Find My INI Files.

The Snap and Free-Coordinate icons are missing.

The separate snap and free-coordinate icons have been removed from the SmartCAM user interface. However, therelated functionality still exists. It is now in a simpler combination mode. This change is documentedin your application's help file. Select Help > What's New. From the What's New help topic, select 'Issues to Note.'

The large Free-Coordinate cursor is jumpy or flashes when moved.

This is due to the Linear Increment being set too coarsely. Set this value to a smaller number, suchas 0.0001.

Open Utility > Increment, then set Linear Increment to a small value. Use File > Keep Defaults tosave this value between SmartCAM sessions.

When not needed, you can also turn off unnecessary snap modes. The snap modes icons allow you toselect whether to snap to End Points, Mid-Point, Center-point, Intersections, and Spline/Polyline controlpoints. If any of these snap modes are not currently needed, turn them off.

The small Snap cursor is not a small 'cross' shape.

This is a Window's controlled setting, configured by your Theme or by the Mouse Properties control panel.Open the Mouse Properties control panel and select the Pointers tab. SmartCAM is using the 'Precision Select' cursor.Whatever cursor you have configured to be used, for this selection, will be used by SmartCAM.

The cursor is leaving trails on the screen as it is moved.

This is an issue with your display driver's OpenGL settings. OpenGL graphics are affected by a number of factors, including the display driver, video chip set, Windows version and service pack, and even DirectX settings. It may take a little experimentation to find which display driver setting is causing the cursor trails and how to resolvethe issue.

Additionally, by default the SmartCAM free coordinate cursor uses a technique called XOR to draw the linesdirectly to the screen and then erase them by drawing over them. This means that the cursor does not have tobe added to OpenGL's display list and the entire screen re-rendered each time the cursor moves. XORdrawing was introduced in OpenGL version 1.2. If your system is using an older version of OpenGL, it will notsupport XOR lines and a different approach will be required to resolve the cursor trails.

Note: You will need to close and restart SmartCAM after each change to see the effects.OpenGL display settings are fixed when the window is opened, so changes made while SmartCAM is running willnot be seen nor used. Exit SmartCAM before making any changes and restart to see the results.

Update your Video Card Driver
Make sure you are running with the most recent drivers for your video card. Updating to current drivers often resolves a number of display problems. Download the drivers directly from the video card manufacturer's website; Windows Update should not be relied upon to handle this properly.
Modify UseGLXorDraw INI Setting
Starting with SmartCAM v19.5, this change can be made from within SmartCAM. Use Utility - Options, set the Category to General Options, and adjust the OpenGL XOR Drawing Mode property. If currently set to Front-buffer, change to Back-buffer. If set to Back-buffer, change to Front-buffer.
For SmartCAM versions older then v19.5, use the manual method described below.
Your SmartCAMcnc.ini file contains an INI setting, in the [Gui] section, named UseGLXorDraw. By default the value for this INI setting is 1. If you are getting cursor trails, change the value to 2. If it is set to 2, try setting it to 1.
If you do not know where your INI files reside, see Technical Bulletin 244: How Do I Find My INI Files.
This INI setting selects which OpenGL buffer will be used for drawing the cursor.
If you are using an ATI graphics card, setting the value to 2 often resolves the problem.
There is a third setting for this INI option. Setting the value to 0 disables the XOR cursor. If after experimenting and finding no combination of settings or drivers that will address the cursor trails, you can set this value to 0. This turns off the XOR logic used for the cursor, instead drawing the cursor like all other geometry. This will have performance considerations, since without using XOR drawing, each time the cursor is moved the entire graphics view will need to be redrawn. Use the value 0 only as a last resort.
This INI setting is documented in the SmartCAM Customization Guide.
Change your Active Profile
Some video card drivers, many NVidia cards for example, include pre-configured settings for various applications. These are often referred to as Profiles. Experiment by changing the active profile to get a different set of display settings. Profiles related to CAD or CAM applications are generally successful. The 'AutoCAD' profile most often works, but user's have reported success with the Inventor, SOLIDWORKS, Remote View, Think Design, and UGS Teamcentre Engineering options as well.
Open your display card's Control Panel; which is also sometimes available under the Display Properties control pane

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