Trace of image on surface like mousehover

[sonumathur]

I want to trace a image diagram on surface of an object like mousehover example at the link

[(https://github.com/marcomusy/vedo/blob/master/examples/basic/mousehover.py)]

I have a surface on which want to trace image surface.zip Image to traced is

Is there any option using vedo to get trace in a sequence.....

[marcomusy]

Hi I'm not sure i understand what are you trying to achieve.. looking at your dataset i get:

from vedo import *
import numpy as np

pts = Mesh("surface.PLY").c([202,209,238]).printInfo()
cols = pts.getCellArray("RGBA")
print(np.max(cols,axis=0))

show(pts, axes=1)

what is it? are you trying to draw the image on top of this mesh? as a texture or somehow by free-hand drawing? Have a look at https://github.com/marcomusy/vedo/blob/master/examples/advanced/spline_draw.py (change pic to your mesh) and/or https://github.com/marcomusy/vedo/blob/master/examples/basic/spline_tool.py

[sonumathur]

@marcomusy sir actually I am trying 3D printing on object having non planner surface. Till today all the 3D printer Gcode generator work on plane surface. For for printing the above image on the surface the should be path like mousehover example. Like by mousehover we can get the coordinate that under mouse motion. As shown in clip

https://user-images.githubusercontent.com/60248559/130121038-02406890-8c1a-404e-894c-0f20614f198d.mp4

[marcomusy]

ok - but then my question is what else you need if the mousehover example already fits your needs?

[sonumathur]

Actually mousehover example pic the coordinate under mouse position. I want to run a trace as from a image. I want to try mousehover over a hand ply file but not working Hand.zip

I try this as

from vedo import *

def func(evt):
    if not evt.actor: return
    pt = evt.picked3d

    pid = evt.actor.closestPoint(pt, returnPointId=True)
    txt = f"Point:  {precision(pt[:2]  ,2)}\n" \
          f"Height: {precision(arr[pid],3)}\n" \
          f"Ground speed: {precision(evt.speed3d*100,2)}"
    arw = Arrow(pt - evt.delta3d, pt, s=0.001, c='orange5')
    vig = evt.actor.vignette(txt, point=pt, offset=(0.4,0.6),
                             s=0.04, c='k', font="VictorMono").followCamera()
    msg.text(txt)
    if len(plt.actors)>3:
        plt.pop()
    plt.add([arw, vig])

Hand = Mesh("model_1.ply").rotate(angle=180).addScalarBar()
arr = Hand.getPointArray("Scalars")
plt = Plotter(axes=1, bg2='lightblue')
plt.addCallback('mouse moving', func)
plt.addCallback('keyboard', lambda e: plt.remove(plt.actors[3:], render=True))

msg = Text2D("", pos='bottom-left', font="VictorMono")

plt.show(Hand, msg, __doc__, viewup='z') 

[marcomusy]

This seems to work fine though:

from vedo import *

def func(evt):
    if not evt.actor: return
    pt = evt.picked3d

    txt = f"Point: {precision(pt[:2],2)}"
    arw = Arrow(pt - evt.delta3d, pt, s=0.002, c='green4')
    vig = evt.actor.vignette(txt, point=pt, offset=(0.4,0.6),
                             s=0.04, c='k', font="VictorMono").followCamera()
    msg.text(txt)
    if len(plt.actors)>3:
        plt.pop()
    plt.add([arw, vig])

plt = Plotter(axes=1, bg2='lightblue')
plt.addCallback('mouse moving', func)
plt.addCallback('keyboard', lambda e: plt.remove(plt.actors[3:], render=True))

hand = Mesh("model_1.ply").rotateX(180)
msg = Text2D("", pos='top-left', font="VictorMono")

plt.show(hand, msg, viewup='z') 

are you able to reproduce it ?

[sonumathur]

Thanks @marcomusy In 2D it's working, but may aim is to get all three coordinates as X, Y and Z what will be programm if there will be Z also.

[marcomusy]

I don't understand your question.. the above example already works in 3d

txt = f"Point: {pt}"

If you are trying to cut-off parts of the mesh you have a look at examples/basic/cutFreeHand.py or from command line vedo -e model_1.ply

[sonumathur]

Thanks @marcomusy

Its working. I have one more questions related to Dimension. How i can measure two points on any surface in millimeters

[marcomusy]

units are always arbitrary! you fix the scale.

If you mean the distance of 2 points walking on the surface check out: https://github.com/marcomusy/vedo/blob/master/examples/advanced/geodesic.py

[sonumathur]

What is method to set scale in mesh. Is there any method to remain the size of mesh to original mesh size. I have processed a mesh in vedo having size about 250mmx250mmx50mm as attached: CUT_Hand.zip

The code applied is: from vedo import * pts = Points("CUT_Hand.ply").clean(0.0075).pointSize(4) surf1 = delaunay2D(pts, mode='fit').clean().lighting('default') pts1= Points(surf1) pts1.write('points.xyz') show(pts, surf1, N=2, axes=1)

after processing and opened in CAD software to shows as:

[marcomusy]

Ops, sorry - I missed this one issue, Have you solved it by now?

[sonumathur]

Thanks for Reply. Not solved sir

[marcomusy]

You can simply use scale(). E.g.:

from vedo import *

m1 = Mesh("data/CUT_Hand.ply")
mcopy = m1.clone()
m1.scale(1.5).write("m2.xyz")

m2 = Mesh("m2.xyz").ps(2)

show(mcopy, m2, N=2, axes=1)

you can also use .shift() to move it around or equivalently origin() to define where the scaling operation should be centered. Sorry again for the late reply.

[sonumathur]

Thanks for your great support. This scale method solve the problem of unit. actually the unit of pointcloud data is meter and it was processed as millimeter.