ATProto Browser

{
  "text": "We can do this by sampling within a cone via www.realtimerendering.com/raytracingge... to generate a ray, and then using jcgt.org/published/00... to form a rotation matrix with the light direction with which to rotate the ray.\n\ncos_theta_max = cos(angular_diameter / 2) = cos(0.25 degrees)",
  "$type": "app.bsky.feed.post",
  "embed": {
    "$type": "app.bsky.embed.external",
    "external": {
      "uri": "https://www.realtimerendering.com/raytracinggems/unofficial_RayTracingGems_v1.9.pdf#0004286901.INDD%3ASec30%3A305",
      "title": "",
      "description": ""
    }
  },
  "langs": [
    "en"
  ],
  "reply": {
    "root": {
      "cid": "bafyreievwsy45zvx4srkl6chm7oojx6gbleaconwso4wtoqw6ypue7mere",
      "uri": "at://did:plc:hliqm47htwrpy7v7vqjhs3ox/app.bsky.feed.post/3lnz4752q2k2r"
    },
    "parent": {
      "cid": "bafyreicqc4leum2ijai7vpqlrm2tukm7b2prno6644ugkwdprbkk6wgvmy",
      "uri": "at://did:plc:hliqm47htwrpy7v7vqjhs3ox/app.bsky.feed.post/3lnz4gmycoc2r"
    }
  },
  "facets": [
    {
      "index": {
        "byteEnd": 86,
        "byteStart": 45
      },
      "features": [
        {
          "uri": "https://www.realtimerendering.com/raytracinggems/unofficial_RayTracingGems_v1.9.pdf#0004286901.INDD%3ASec30%3A305",
          "$type": "app.bsky.richtext.facet#link"
        }
      ]
    },
    {
      "index": {
        "byteEnd": 145,
        "byteStart": 121
      },
      "features": [
        {
          "uri": "https://jcgt.org/published/0006/01/01/paper.pdf",
          "$type": "app.bsky.richtext.facet#link"
        }
      ]
    }
  ],
  "createdAt": "2025-04-30T06:00:26.365Z"
}