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我有这个代表管道内部区域的纹理：

在此处输入图像描述

我创建了一个简单的圆柱体模型GeometryModel3D（

在此处输入图像描述

纹理的左右边缘在上面的黑色接缝线处相交，这是不需要的。

我不能在那里使用单个顶点进行平滑延续，因为该点对应于 0 度和 360 度，这是单个角度，但是 2D 纹理边缘上有两个不同的点。

所以我在同一位置使用了一对顶点，但每个顶点对应于源纹理中的不同点。

有什么办法可以隐藏接缝线吗？

模型创建代码：

    private void SceneViewerWindowOnLoaded(object sender, RoutedEventArgs e)
    {
        var imageSource = new BitmapImage(new Uri("pack://application:,,,/Resources/out1.jpg"));

        var meshGeometry3D = new MeshGeometry3D();

        double circumference = imageSource.PixelWidth;
        double radius = (circumference / (2.0 * Math.PI));

        double angleSegment = (2.0 * Math.PI / SegmentCountTrans);

        double sizeSegmentLong = ((double)imageSource.PixelHeight / SegmentCountLong);
        double sizeSegmentTrans = ((double)imageSource.PixelWidth / SegmentCountTrans);

        for (int indexSegmentLong = 0; indexSegmentLong < SegmentCountLong; indexSegmentLong++)
        {
            double depth = (indexSegmentLong * sizeSegmentLong);

            for (int indexSegmentTrans = 0; indexSegmentTrans < SegmentCountTrans; indexSegmentTrans++)
            {
                meshGeometry3D.Positions.Add(GetVertexPosition(indexSegmentTrans, depth, radius, angleSegment));
                meshGeometry3D.TextureCoordinates.Add(new Point(indexSegmentTrans * sizeSegmentTrans, depth));
            }

            // add one extra vertex representing 360 degrees for complete wrap-around
            meshGeometry3D.Positions.Add(GetVertexPosition(SegmentCountTrans, depth, radius, angleSegment));
            meshGeometry3D.TextureCoordinates.Add(new Point(SegmentCountTrans * sizeSegmentTrans, depth));
        }

        meshGeometry3D.TriangleIndices.Clear();

        for (int indexSegmentLong = 0; indexSegmentLong < (SegmentCountLong - 1); indexSegmentLong++)
        {
            for (int indexSegmentTrans = 0; indexSegmentTrans < SegmentCountTrans; indexSegmentTrans++)
            {
                int indexCurrent = (indexSegmentLong * (SegmentCountTrans + 1) + indexSegmentTrans);

                meshGeometry3D.TriangleIndices.Add(indexCurrent);
                meshGeometry3D.TriangleIndices.Add(indexCurrent + 1);
                meshGeometry3D.TriangleIndices.Add(indexCurrent + SegmentCountTrans + 1);

                meshGeometry3D.TriangleIndices.Add(indexCurrent + SegmentCountTrans + 1);
                meshGeometry3D.TriangleIndices.Add(indexCurrent + 1);
                meshGeometry3D.TriangleIndices.Add(indexCurrent + SegmentCountTrans + 2);
            }
        }

        var geometryModel3D = new GeometryModel3D
                            {
                                Geometry = meshGeometry3D,
                                Material = new DiffuseMaterial
                                           {
                                               Brush = new ImageBrush(imageSource)
                                           }
                            };

        this.SceneViewer.Model = geometryModel3D;
    }

    private static Point3D GetVertexPosition(int indexSegmentAngle, double depth, double radius, double angleSegment)
    {
        double angle = (StartAngle + indexSegmentAngle * angleSegment);

        return new Point3D(
            radius * Math.Cos(angle),
            radius * Math.Sin(angle),
            -depth);
    }

Viewport3D包含模型的元素的XAML 代码：

<Viewport3D x:Name="Viewport3D">
        <Viewport3D.Camera>
            <PerspectiveCamera x:Name="Camera" Position="0.0,0.0,0.0" LookDirection="0.0,0.0,-1.0" UpDirection="0.0,1.0,0.0" FieldOfView="90"/>
        </Viewport3D.Camera>
        <ModelVisual3D>
            <ModelVisual3D.Content>
                <AmbientLight Color="White"/>
            </ModelVisual3D.Content>
        </ModelVisual3D>
        <ModelVisual3D x:Name="ModelVisualModel"/>
    </Viewport3D>
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2 回答 2

4

创建图像画笔时，尝试将 TileMode 设置为 TileMode.Tile 并将 ViewportUnits 设置为 BrushMappingMode.Absolute。如果这仍然不起作用，请在此处发表后续评论，我将尝试在我的最后重现它。

于 2014-01-31T09:49:59.667 回答
2

我使用 DrawingBrush 而不是 Imagebrush。这修复了接缝，并且在设置缓存提示时我还获得了 fps 提升。

Brush brush = new DrawingBrush(new ImageDrawing(_texture, new Rect(0,0,1,1)));
RenderOptions.SetCachingHint(brush , CachingHint.Cache);
RenderOptions.SetCacheInvalidationThresholdMinimum(brush , 0.5);
RenderOptions.SetCacheInvalidationThresholdMaximum(brush , 2.0);
于 2015-07-09T16:26:49.493 回答