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Cone sizeref fixes #2715

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merged 9 commits into from
Jun 11, 2018
Merged

Cone sizeref fixes #2715

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8619ce1
use gl-cone3d picking instead of gl-scatter3d overlay
etpinard Jun 8, 2018
6257642
[tmp] use gl-cone3d from https://github.com/gl-vis/gl-cone3d/pull/12
etpinard Jun 8, 2018
4836861
try fixing cone 'absolute' scaling
etpinard Jun 8, 2018
bb4bde7
new cone baselines
etpinard Jun 7, 2018
67f372d
fixup cone tests
etpinard Jun 11, 2018
10475be
fixups in sizeref description
etpinard Jun 11, 2018
7236e2d
improve sizeref default for 0-norm cones
etpinard Jun 11, 2018
c8a40d5
bump gl-cone3d to 1.1.0
etpinard Jun 11, 2018
a1ba953
more sizemode/sizeref fixups
etpinard Jun 11, 2018
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20 changes: 13 additions & 7 deletions src/traces/cone/attributes.js
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Original file line number Diff line number Diff line change
Expand Up @@ -112,20 +112,26 @@ var attrs = {
editType: 'calc',
dflt: 'scaled',
description: [
'Sets the mode by which the cones are sized.',
'If *scaled*, `sizeref` scales such that the reference cone size',
'for the maximum vector magnitude is 1.',
'If *absolute*, `sizeref` scales such that the reference cone size',
'for vector magnitude 1 is one grid unit.'
'Determines whether `sizeref` is set as a *scaled* (i.e unitless) scalar',
'(normalized by the max u/v/w norm in the vector field) or as',
'*absolute* value (in unit of velocity).'
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I wouldn't use the word "velocity" here - you can show many other quantities as vector fields (electric fields, as just one common example). Just say "in the same units as the vector field" or some such.

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oh right, good call!

].join(' ')
},
sizeref: {
valType: 'number',
role: 'info',
editType: 'calc',
min: 0,
dflt: 1,
description: 'Sets the cone size reference value.'
description: [
'Adjusts the cone size scaling.',
'The size of the cones is determined by their u/v/w norm multiplied a factor and `sizeref`.',
'This factor (computed internally) corresponds to the minimum "time" to travel across two',
'two successive x/y/z positions at the average velocity of those two successive positions',
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two twos is one two too many

'All cones in a given trace use the same factor.',
'With `sizemode` set to *scaled*, `sizeref` is unitless, its default value is *0.5*',
'With `sizemode` set to *absolute*, `sizeref` has units of velocity, its the default value is',
'half the sample\'s maximum vector norm.'
].join(' ')
},

anchor: {
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18 changes: 11 additions & 7 deletions src/traces/cone/convert.js
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Expand Up @@ -59,7 +59,6 @@ function zip3(x, y, z) {
}

var axisName2scaleIndex = {xaxis: 0, yaxis: 1, zaxis: 2};
var sizeMode2sizeKey = {scaled: 'coneSize', absolute: 'absoluteConeSize'};
var anchor2coneOffset = {tip: 1, tail: 0, cm: 0.25, center: 0.5};
var anchor2coneSpan = {tip: 1, tail: 1, cm: 0.75, center: 0.5};

Expand Down Expand Up @@ -88,15 +87,21 @@ function convert(scene, trace) {

coneOpts.colormap = parseColorScale(trace.colorscale);
coneOpts.vertexIntensityBounds = [trace.cmin / trace._normMax, trace.cmax / trace._normMax];

coneOpts[sizeMode2sizeKey[trace.sizemode]] = trace.sizeref;
coneOpts.coneOffset = anchor2coneOffset[trace.anchor];

var meshData = conePlot(coneOpts);
if(trace.sizemode === 'scaled') {
// unitless sizeref
coneOpts.coneSize = trace.sizeref || 0.5;
} else {
// sizeref here has unit of velocity
coneOpts.coneSize = (trace.sizeref / trace._normMax) || 0.5;
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@etpinard etpinard Jun 11, 2018 •
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Previously, coneSize under sizemode: 'absolute' was scaled using the max norm of the "scaled" u/v/w vectors (that same dataScale than in #2646). This made sizeref under sizemode: 'absolute' had little meaning.

Now, sizeref under sizemode: 'absolute' is scaled by the "input" u/v/w max norm should make this thing a little less confusing.

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Nice! Two questions:

  • When is the || 0.5 (in either case) necessary?
  • What if the field is uniformly zero? then _normMax will be 0 and coneSize will be Infinity... which I suppose is OK if the end result is no errors and nothing drawn.

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What if the field is uniformly zero?

Oh right, Infinity is truthy. Good call!

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When is the || 0.5 (in either case) necessary?

Currently, the sizeref attribute declaration does not set a dflt field. In practice I guess it does have a hard default of 0.5. But technically under the sizemode: 'absolute', the sizemode default is 0.5 * trace._normMax.

}

var meshData = conePlot(coneOpts);

// pass gl-mesh3d lighting attributes
meshData.lightPosition = [trace.lightposition.x, trace.lightposition.y, trace.lightposition.z];
var lp = trace.lightposition;
meshData.lightPosition = [lp.x, lp.y, lp.z];
meshData.ambient = trace.lighting.ambient;
meshData.diffuse = trace.lighting.diffuse;
meshData.specular = trace.lighting.specular;
Expand All @@ -105,8 +110,7 @@ function convert(scene, trace) {
meshData.opacity = trace.opacity;

// stash autorange pad value
trace._pad = anchor2coneSpan[trace.anchor] * meshData.vectorScale * trace.sizeref;
if(trace.sizemode === 'scaled') trace._pad *= trace._normMax;
trace._pad = anchor2coneSpan[trace.anchor] * meshData.vectorScale * meshData.coneScale * trace._normMax;

return meshData;
}
Expand Down