All Questions
12
questions
0
votes
1
answer
34
views
Retrieving the indices of the centers with rgl::cylinder3d
I'm drawing a spherical Lissajous curve with rgl::cylinder3d:
library(rgl)
library(primes)
l <- function(m1, m2, alpha = 0) {
g <- gcd(m1, m2)
t_ <- seq(0, 2*pi/g, length.out = 400L)
...
- 84k
0
votes
2
answers
58
views
How to match the color of a rgl mesh and the color of a line on this mesh?
When you plot a rgl mesh and a line on the surface on this mesh with the same color, the line is visible:
library(rgl)
shade3d(cube3d(), color = "cyan")
lines3d(rbind(c(-1,-1,-1), c(1,1,-1)),...
- 84k
1
vote
1
answer
53
views
How to plot a surface z=f(x,y) with a hole?
I want to make a plot similar to the one at left (the goal is to illustrate an interpolation: the plot at right).
I did this plot with a constrained Delaunay tessellation (with the delaunay package) ...
- 84k
1
vote
1
answer
83
views
How to get a dull and shadowed mesh with rgl?
Below are two meshes of the Barth sextic. The first one is obtained with the R package rgl. It is rather shiny and it has almost no shadow. The second one is obtained with the Haskell package OpenGL. ...
- 84k
1
vote
0
answers
447
views
Segment 3D mesh and extract mesh vertices and landmarks for each segment
Here is my 3D facial mesh and landmarks available from here:
library(Rvcg)
library(rgl)
library(Morpho) #read.fcsv
mymesh <- vcgPlyRead("C:\\Users\\Patrick Wen\\Desktop\\mymesh.ply")
...
- 1,177
0
votes
2
answers
663
views
Calculate area on 3D surface mesh encolosed by four arbitrary points from coordinate data
I have human facial data as below:
library(Rvcg)
library(rgl)
data(humface)
lm <- matrix(c(1.0456182e+001, -3.5877686e+001, 5.0972912e+001, 2.2514189e+001,
8.4171227e+001, 6....
- 1,177
0
votes
1
answer
433
views
Decimate 3D surface mesh evenly and preserving bilaterally symmetry
Here is a sample of 3D facial surface mesh. As can been seen from Fig 1 below, the landmarks are bilaterially symmetric. I wish to reduce the number of landmarks.
Here face is the coordinates of the ...
- 1,177
1
vote
1
answer
621
views
Using R: how to animate multiple 3D objects in single rgl canvas?
I have data where a participant had positional data on each hand:
left:
right:
positional data has
pos.x
pos.y
pos.z
at some time t
The initial question was about importing OBJ to work with RGL: ...
- 973
1
vote
1
answer
321
views
plot alphashape3d in plotly or ggplot2 for R
I am trying to take a 3d alphashape and plot it using the plotly or the ggplot2 packages in R. Below is an example using R's native plotting package:
Torus example
library(alphashape3d)
T1 <- ...
- 21
3
votes
2
answers
956
views
How can I import and plot a triangular mesh in R?
I would like to plot my model output in R
It is a triangular mesh in the format
x1 y1 z1 x2 y2 z2 x3 y3 z3 value
Where each row represents a triangle, and I would like to plot these triangles with ...
- 31.6k
0
votes
0
answers
451
views
Plot 3d surface map from data frame
I first begin by running the code below to tune a SVM:
tunecontrol <- tune.control(nrepeat=5, sampling = "fix",cross=5, performances=T)
tune_svm1 <- tune(svm,
...
- 1,535
2
votes
1
answer
566
views
Can I map an "OBJ" mesh file w/ existing R packages?
Before I get too deep into a rabbit hole full of quicksand, here's a subset of the text in an OBJ file (737 aircraft in this case)
v -1.684813 -4.962262 2.184269
v -1.684813 -4.672744 2.090231
v -1....
- 21.3k