Hi, I don't think there is a pre-built axis item for 3D. You might be able to build one yourself by extending the GLGridItem and draw labels at the ends of the grid lines. You can at least make a "box" using three grids with something like (modifying GLSurfacePlot.py example):
## Add a grid to the view gxz = gl.GLGridItem() gxz.scale(2,2,1) gxz.translate(0, 0, -20) gxz.setDepthValue(10) # draw grid after surfaces since they may be translucent w.addItem(gxz) gxy = gl.GLGridItem() gxy.scale(2,2,1) gxy.translate(0, 0, -20) gxy.rotate(90, 10, 0, 0) gxy.setDepthValue(10) w.addItem(gxy) gyz = gl.GLGridItem() gyz.scale(2,2,1) gyz.translate(0, 0, -20) gyz.rotate(90, 0, 10, 0) gyz.setDepthValue(10) w.addItem(gyz) There was some discussion here about drawing labels on the 3D plots: https://groups.google.com/forum/#!topic/pyqtgraph/FNxcMh3M6nc Patrick On Thursday, 2 May 2019 02:35:04 UTC+9:30, Mostafa wrote: > > Hi Patrick, > > I used the following code for updating the shader colors: > > self.p1.shader()['colorMap'] = np.array([.01/zmax, # red 1 > 0, # red 2 > 0.01, # red 3 > 0.01/zmax, # green 1 > 0, # green 2 > .05, # green 3 > 1/zmax, # blue 1 > -zmin, # blue 2 > 1]) # blue 3 > > > Thank you for your help. The library is great and it is very fast. > However, I still do not know how to add x and y axes? In VisPy, there is > an example for plotting > <https://github.com/vispy/vispy/blob/master/examples/basics/scene/surface_plot.py>the > > axes, but I could not find a similar one in PyQtGraph. Do you have an > example of this? > > Best regards, > Mostafa > > > > On Saturday, April 27, 2019 at 2:47:44 AM UTC-4, Patrick wrote: >> >> Hi, >> >> Yeah, the GL stuff doesn't use the same colour maps as the 2D images. I >> can't see any documentation on the shaders ( >> http://www.pyqtgraph.org/documentation/3dgraphics/glmeshitem.html) that >> are used to colour the surface. Looking at the code under shaders.py does >> help though. For the "heightColor" shader, the 9 numbers in the array that >> are used (as in the Surface Plot example) are variables used in a formula >> to compute the RGB colour. >> >> From comment in code: >> ## colors fragments by z-value. >> ## This is useful for coloring surface plots by height. >> ## This shader uses a uniform called "colorMap" to determine how to map >> the colors: >> ## red = pow(z * colorMap[0] + colorMap[1], colorMap[2]) >> ## green = pow(z * colorMap[3] + colorMap[4], colorMap[5]) >> ## blue = pow(z * colorMap[6] + colorMap[7], colorMap[8]) >> ## (set the values like this: shader['uniformMap'] = array([...]) >> >> I assume the output RGB values are expressed as a range from 0 to 1. So >> to tweak the example to work with ranges from say zmin to zmax, I think >> something like: >> >> p4.shader()['colorMap'] = np.array([0.2*(zmax - zmin), 2 - zmin, 0.5, 0.2 >> *(zmax - zmin), 1 - zmin, 1, 0.2*(zmax - zmin), 0 - zmin, 2]) >> >> >> Patrick >> >> On Saturday, 27 April 2019 00:55:42 UTC+9:30, Mostafa wrote: >>> >>> Hi Partick, >>> >>> It works well when we set the following parameters for the >>> GLSurfacePlotItem: >>> >>> computeNormals=False, smooth=False >>> >>> >>> However, I have a problem with the colorMap since the default mapping >>> seems to be for data which is in [-1,1]. I have to change the mapping for >>> an arbitrary data range since in general, I do not know the range but I can >>> retrieve it when the code runs. I looked to the documentation for the >>> colorMap >>> <http://www.pyqtgraph.org/documentation/widgets/imageview.html?highlight=colormap#pyqtgraph.ImageView.setColorMap> >>> >>> but I barely understood how to define it and set in GLSurfacePlotItem. >>> Besides, I want to add x,y axes which are fixed and they are necessary for >>> getting meaning to the surface plot. Any recommendations will be >>> appreciated. >>> >>> Best, >>> Mostafa >>> >>> >>> On Tuesday, April 23, 2019 at 11:44:41 PM UTC-4, Patrick wrote: >>>> >>>> Hi, >>>> >>>> I don't use the 3D capabilities of pyqtgraph, but the example under 3D >>>> Graphics/Surface Plot ( >>>> https://github.com/pyqtgraph/pyqtgraph/blob/develop/examples/GLSurfacePlot.py) >>>> >>>> has an animated 3D surface that looks to be rendering at 100+ FPS on my >>>> machine. Does that help? Otherwise if you can post a minimum working >>>> example then we might be able to suggest some ideas. >>>> >>>> Patrick >>>> >>>> On Tuesday, 23 April 2019 13:27:59 UTC+9:30, Mostafa wrote: >>>>> >>>>> Hello, >>>>> >>>>> My eventual goal is to have a surface like the one that Matlab has for >>>>> plotting a 2D array of size N by M. For my application, M and N are not >>>>> greater than 256, so the greatest matrix I have has less than 100K >>>>> entries. >>>>> However, I could not find a remedy for the slow updating of the >>>>> GLSurfacePlotItem. Basically, as the human eye perception is limited, the >>>>> frame update speed should be around 25-30 frame per second. Besides, the >>>>> surface plot is much far away from the nice representation in Matlab >>>>> where >>>>> the plot has x and y axes with an option to add a colorbar to show the >>>>> color code values. There should be tricks to speed up the process similar >>>>> to the suggestion for 2D plot to disable autoscale in order to update the >>>>> graph much faster. >>>>> >>>>> Any idea? >>>>> >>>>> Best regards, >>>>> Mostafa >>>>> >>>>> >>>> -- You received this message because you are subscribed to the Google Groups "pyqtgraph" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/pyqtgraph/5fe85ac2-839c-4dc6-8829-3c41524dd165%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
