Questions about STL Rendering

[JohnZhan2023]

First of all, I would like to express my gratitude for your outstanding contributions to LBM simulations, which have been of great help to me.

While importing STL files for rendering, I noticed that the detailed shapes of the models appear somewhat blurry, and shadows are not rendered. The specific contours are only relatively clear when displaying the lattice. I would like to confirm whether shadow rendering is currently supported and if there are plans to support it in the future.

Like this one above, we can't ensure its torus shape only according to the one view image.

[ProjectPhysX]

Hi @JohnZhan2023,

models might look a bit blurry due to voxelization and marching-cubes surface reconstruction from voxelized geometry. The models are rendered exactly as the physical simulation sees them - discretized on the grid.
The rendering does basic shading (where the light source is set as the camera position), but indeed no shadows are cast. For better front-on shading, you can reduce the gain factor a bit, by changing this line to

return color_mul(c, max(1.0f*fabs(dot(normal, d))*rsqrt(nl2*dl2), 0.3f));

I do not plan to implement shadow casting in the future. I want to keep the renderer as simple as possible without extra clutter.

Kind regards,
Moritz

[JohnZhan2023]

Thank you for your patient explanation! It does good to me!

[JohnZhan2023]

If I want to add the shading myself, so how can I revise the code? Can you give me some advice?