3DGS visualization

[Zhang Wenhao]

Excellent work, I would like to ask how to project 3DGS point clouds onto the corresponding rendered image? What reference materials are there to learn from?

[Guangchi Fang]

Thank you for your interests.
It is perspective projection.
Please check out diff-gaussian-rasterization/cuda_rasterizer/forward.cu line 196 to 200:
// Transform point by projecting
float3 p_orig = { orig_points[3 * idx], orig_points[3 * idx + 1], orig_points[3 * idx + 2] };
float4 p_hom = transformPoint4x4(p_orig, projmatrix);
float p_w = 1.0f / (p_hom.w + 0.0000001f);
float3 p_proj = { p_hom.x * p_w, p_hom.y * p_w, p_hom.z * p_w };
and line 233:
float2 point_image = { ndc2Pix(p_proj.x, W), ndc2Pix(p_proj.y, H) };