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Bug 146

Summary:	[TV52012990] I have uploaded an example of an IsoSurface plot (find it attached) t...
Product:	VCL TeeChart	Reporter:	narcís calvet <narcis>
Component:	Series	Assignee:	Steema Issue Manager <issuemanager>
Status:	RESOLVED NOTABUG
Severity:	major	CC:	david
Priority:	Normal
Version:	unspecified
Target Milestone:	---
Hardware:	All
OS:	All
Chart Series:	---	Delphi / C++ Builder RAD IDE Version:
Attachments:	IsoSurface

Description narcís calvet 2013-11-20 10:00:12 EST

I have uploaded an example of an IsoSurface plot (find it attached) that renders incorrectly, showing "holes" in the surface. You can open the plot using a current version of TeeChart office.

A similar problem occurs in Contour plots, where the triangles do not overlap completely, resulting in the background of the chart showing. [created:2008-04-22T12:48:58.000+01:00 reported by:narcis@steema.com reported in version:8.01 (TeeChart VCL)]

Comment 1 david berneda 2013-12-03 09:49:53 EST

Created attachment 40 [details]
IsoSurface

Comment 2 david berneda 2013-12-03 10:18:23 EST

The problem is the Series1 "PaletteStep" value is not big enough to cover all the Y values range from min to max.

Palette "Min + (Steps * Step)" determines the maximum value.

Currently, cells that have bigger Y values than the maximum palette value aren't painted.

One solution is to change this default behaviour, to make that cells use the max palette color instead of not painting them at all.

Not sure if this can badly affect to existing apps though.

Comment 3 david berneda 2013-12-19 11:11:25 EST

After some thinking, I'd consider this issues as "not a bug".

Cells with values outside (bigger than) the maximum palette value should not be painted because palette levels determine "Up To Value" quantities, and not bigger.

The attached example *.tee file fills all cells if either the PaletteStep:=0 (automatic), or an additional PaletteSteps is added (25 instead of 24), thus covering the maximum series value.

On the other hand, with the new contour-filling algorithm, the output looks much better.