Property Documentation

alphaMultiplier : float

This property holds the value that the alpha value of every texel of the volume texture is multiplied with at the render time.

This property can be used to introduce uniform transparency to the volume. If preserveOpacity is true, only texels with at least some transparency to begin with are affected, and fully opaque texels are not affected. The value must not be negative. Defaults to 1.0f.

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See also preserveOpacity and textureData.

colorTable : QVector<QRgb>

This property holds the array containing the colors for indexed texture formats.

If the texture format is not indexed, this array is not used and can be empty.

Defaults to 0.

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See also textureData, setTextureFormat(), and QImage::colorTable().

drawSliceFrames : bool

This property holds whether slice frames are drawn around the volume.

If this property value is true, the frames of slices indicated by slice index properties will be drawn around the volume. If it is false, no slice frames will be drawn.

Drawing slice frames is independent of drawing slices, so you can show the full volume and still draw the slice frames around it. This is useful when using renderSlice() to display the slices outside the graph itself.

Defaults to false.

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See also sliceIndexX, sliceIndexY, sliceIndexZ, drawSlices, and renderSlice().

drawSlices : bool

This property holds whether the specified slices are drawn instead of the full volume.

If this property value is true, the slices indicated by slice index properties will be drawn instead of the full volume. If it is false, the full volume will always be drawn. Defaults to false.

Note: The slices are always drawn along the item axes, so if the item is rotated, the slices are rotated as well.

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See also sliceIndexX, sliceIndexY, and sliceIndexZ.

preserveOpacity : bool

This property holds whether the alpha multiplier is applied to all texels.

If this property value is true, alphaMultiplier is only applied to texels that already have some transparency. If it is false, the multiplier is applied to the alpha value of all texels. Defaults to true.

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See also alphaMultiplier.

sliceFrameColor : QColor

This property holds the color of the slice frame.

Transparent slice frame color is not supported.

Defaults to black.

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See also drawSliceFrames.

sliceFrameGaps : QVector3D

This property holds the size of the air gap left between the volume itself and the frame in each dimension.

The gap can be different on different dimensions. The values are fractions of the volume thickness in the same dimension. The values cannot be negative.

Defaults to QVector3D(0.01, 0.01, 0.01).

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See also drawSliceFrames.

sliceFrameThicknesses : QVector3D

This property holds the thickness of the slice frames for each dimension.

The values are fractions of the volume thickness in the same dimension. The values cannot be negative.

Defaults to QVector3D(0.01, 0.01, 0.01).

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See also drawSliceFrames.

sliceFrameWidths : QVector3D

This property holds the width of the slice frame.

The width can be different on different dimensions, so you can for example omit drawing the frames on certain sides of the volume by setting the value for that dimension to zero. The values are fractions of the volume thickness in the same dimension. The values cannot be negative.

Defaults to QVector3D(0.01, 0.01, 0.01).

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See also drawSliceFrames.

sliceIndexX : int

This property holds the x-dimension index into the texture data indicating which vertical slice to show.

Setting any dimension to negative indicates no slice or slice frame for that dimension is drawn. If all dimensions are negative, no slices or slice frames are drawn and the volume is drawn normally.

Defaults to -1.

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See also textureData, drawSlices, and drawSliceFrames.

sliceIndexY : int

This property holds the y-dimension index into the texture data indicating which horizontal slice to show.

Setting any dimension to negative indicates no slice or slice frame for that dimension is drawn. If all dimensions are negative, no slices or slice frames are drawn and the volume is drawn normally.

Defaults to -1.

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See also textureData, drawSlices, and drawSliceFrames.

sliceIndexZ : int

This property holds the z-dimension index into the texture data indicating which vertical slice to show.

Setting any dimension to negative indicates no slice or slice frame for that dimension is drawn. If all dimensions are negative, no slices or slice frames are drawn and the volume is drawn normally.

Defaults to -1.

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See also textureData, drawSlices, and drawSliceFrames.

textureData : QVector<uchar>*

This property holds the array containing the texture data in the format specified by textureFormat.

The size of this array must be at least (textureDataWidth * textureHeight * textureDepth * texture format color depth in bytes).

A 3D texture is defined by a stack of 2D subtextures. Each subtexture must be of identical size (textureDataWidth * textureHeight), and the depth of the stack is defined by the textureDepth property. The data in each 2D texture is identical to a QImage data with the same format, so QImage::bits() can be used to supply the data for each subtexture.

Ownership of the new array transfers to the QCustom3DVolume instance. If another array is set, the previous array is deleted. If the same array is set again, it is assumed that the array contents have been changed and the graph rendering is triggered.

Note: Each x-dimension line of the data needs to be 32-bit aligned. If textureFormat is QImage::Format_Indexed8 and the textureWidth value is not divisible by four, padding bytes might need to be added to each x-dimension line of the data. The textureDataWidth() function returns the padded byte count. The padding bytes should indicate a fully transparent color to avoid rendering artifacts.

Defaults to 0.

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See also colorTable, setTextureFormat(), setSubTextureData(), and textureDataWidth().

textureDepth : int

This property holds the depth of the 3D texture defining the volume content in pixels.

Defaults to 0.

Note: The textureData value may need to be resized or recreated if this value is changed. Defaults to 0.

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See also textureData, textureWidth, textureHeight, and setTextureFormat().

textureHeight : int

This property holds the height of the 3D texture defining the volume content in pixels.

Defaults to 0.

Note: The textureData value may need to be resized or recreated if this value is changed. Defaults to 0.

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See also textureData, textureWidth, textureDepth, and setTextureFormat().

textureWidth : int

This property holds the width of the 3D texture defining the volume content in pixels.

Defaults to 0.

Note: The textureData value may need to be resized or recreated if this value is changed. Defaults to 0.

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See also textureData, textureHeight, textureDepth, setTextureFormat(), and textureDataWidth().

useHighDefShader : bool

This property holds whether a high or low definition shader is used to render the volume.

If this property value is true, a high definition shader is used. If it is false, a low definition shader is used.

The high definition shader guarantees that every visible texel of the volume texture is sampled when the volume is rendered. The low definition shader renders only a rough approximation of the volume contents, but at a much higher frame rate. The low definition shader does not guarantee that every texel of the volume texture is sampled, so there may be flickering if the volume contains distinct thin features.

Note: This value does not affect the level of detail when rendering the slices of the volume.

Defaults to true.

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See also renderSlice().