render_highquality PNG output: incorrect solid colour when soil=TRUE in plot_3d

[richardtc]

When soil is set to TRUE in the plot_3d() function, the solid colour is incorrectly rendered in the PNG output from the render_highquality() function.

For example:

However, in the rgl window (RStudio Server/Rmarkdown), the solid colour is correctly rendered.

This might be an issue with the render_highquality() function?

A code snippet, which creates the error in the PNG output from the render_highquality() function:

A code snippet:
  plot_3d(
    v_mat_nas,
    zscale = 20,
    theta = 160,
    phi = 25, # 45,
    zoom = 0.7,
    windowsize = c(3000, 3000),
    lineantialias = TRUE,
    # solidcolor = "#4B3A26",
    # solidlinecolor = "#362312",
    # shadowcolor = "grey20"
    soil = TRUE
)

render_compass(
  position = "E",
  scale_distance = 0.7,
  compass_radius = 100
)

Sys.sleep(0.2)

render_highquality(
  filename = "3d_output.png",
  clamp_value = 300,
  lightintensity = 800,
  lightaltitude = 70,
  lightdirection = 115,
  ground_material = rayrender::diffuse(checkerperiod = 30, 
                                       checkercolor =  "white"),
  min_variance = 0
)

My session info details:

─ Session info 
 setting  value
 version  R version 4.3.2 (2023-10-31)
 os       Ubuntu 22.04.3 LTS
 system   x86_64, linux-gnu
 ui       RStudio
 language (EN)
 collate  C.UTF-8
 ctype    C.UTF-8
 date     2024-02-19
 rstudio  2023.09.1+494 Desert Sunflower (server)
 pandoc   3.1.1 @ /usr/lib/rstudio-server/bin/quarto/bin/tools/ (via rmarkdown)


Selected packages:
 ambient        * 1.0.2     2022-09-08 [1] RSPM (R 4.3.0)
 rayimage       * 0.10.0    2024-01-06 [1] Github (tylermorganwall/rayimage@8497883)
 rayrender      * 0.31.2    2024-01-02 [1] Github (tylermorganwall/rayrender@3b200c4)
 rayshader      * 0.37.1    2024-01-27 [1] Github (tylermorganwall/rayshader@e1d2766)
 rayvertex        0.10.4    2024-01-02 [1] Github (tylermorganwall/rayvertex@a352f40)
 sf             * 1.0-16    2024-02-06 [1] Github (r-spatial/sf@9073a52)
 terra          * 1.7-72    2024-02-06 [1] https://rspatial.r-universe.dev (R 4.3.2)