3D scene visual testing

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.AutoHideLabels = true;
    model1.AntiAliasing = false;
    model1.AccurateTransparency = false;

    model1.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.