Can we change background color?

[keiohta]

Hi author, would it be possible to change the background color to white (transparent)? Thanks!

[fbxiang]

You can customize the shader following these steps:

1. make a copy of the vulkan_shader folder
2. pick the shader pack you want to use (I believe the default is the ibl)
3. Modify the background color used in deferred.frag (this line:

   SAPIEN/vulkan_shader/ibl/deferred.frag

   Line 242 in 6bc3f4e

   outLighting = vec4(getBackgroundColor((cameraBuffer.viewMatrixInverse * csPosition).xyz), 1.f);

   ) For example, change it to outLighting=vec4(1,1,1,0)
4. call sapien.VulkanRenderer.set_viewer_shader_dir and/or sapien.VulkanRenderer.set_camera_shader_dir before creating the viewer or the camera. Give it the directory of the modified ibl folder.

[keiohta]

Thanks! I successfully changed the background.

Actually, I failed to change the shader directory, so I directly modified the default deferred.frag and the background becomes white.

Just for your information, I only added

sapien.VulkanRenderer.set_viewer_shader_dir("ibl")
sapien.VulkanRenderer.set_camera_shader_dir("ibl")

before creating engine and renderer, and encountered an error

  File "/home/ohta/anaconda3/envs/sapien/lib/python3.8/site-packages/sapien/utils/viewer.py", line 1855, in render
    self.window.render(
RuntimeError: custom sampler "Environment" is not set in the renderer

The SAPIEN version I use is 1.1.1.

[fbxiang]

You are right. For future reference, SAPIEN 2 has removed the default shader and defaults to ibl. The "Environment" problem is also fixed at some point(dev branch).