Eyeshot contains a utility to perform an accurate check between images.
The general idea is very simple: a pixel-by-pixel comparison.
The method devDept.ImageComparison.CompareImages() compares 2 bitmaps and returns an image showing the different pixels and the mismatch percentage between them.
| Expected image | Current image | Differences |
Code snippet:
Bitmap expected = new Bitmap("Original.bmp");
Bitmap current = CreateReferenceImage(viewType.Trimetric);
double mismatch = devDept.ImageComparison.CompareImages(expected, current, out Bitmap diffImage);
Console.WriteLine($"The mismatch percentage is {mismatch}");
// This method shows the code internally used till Eyeshot 12 to generate the images. Feel free to change it.
private Bitmap CreateReferenceImage(viewType viewType = viewType.Trimetric)
{
model1.ActiveViewport.AutoHideLabels
model1.AntiAliasing = false;
model1.AccurateTransparency = false;
model1.ActiveViewport.DisplayMode = displayType.Flat;
model1.Flat.ColorMethod = flatColorMethodType.EntityMaterial;
model1.Flat.SilhouettesDrawingMode = silhouettesDrawingType.LastFrame;
Viewport viewport = model1.ActiveViewport;
// Transparent background
viewport.Background.StyleMode = backgroundStyleType.None;
viewport.Camera.ProjectionMode = projectionType.Perspective;
// Prepare the viewport for generating image
viewport.Camera.FocalLength = 50;
if (viewport.OriginSymbol != null) viewport.OriginSymbol.Visible = false;
if (viewport.ViewCubeIcon != null) viewport.ViewCubeIcon.Visible = false;
if (viewport.CoordinateSystemIcon != null) viewport.CoordinateSystemIcon.Visible = false;
// allows to check proper face normal orientation
model1.Backface.ColorMethod = backfaceColorMethodType.SingleColor;
if (viewType != viewType.Other)
{
Size = new System.Drawing.Size(1024, 768);
viewport.SetView(viewType);
viewport.ZoomFit(4);
}
return model1.RenderToBitmap(1);
}
Previous versions of this article: Eyeshot 11.
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