# DolphinLightIntersectAt

Dolphin light intersect at.

Last updated: 2026-09-09

Package: dolphin.lightlab | Status: source-declared

Tags: cpu, dolphin, dolphin.lightlab, function, lightlab, source-example

Build bounded lighting experiments with geometry, visibility, transport, film, and GPU/CPU contracts.

```yh
external DolphinLightIntersectAt(dolphinLightShape s,int index,float ox,float oy,float oz,float dx,float dy,float dz,float maximum,float time) returns dolphinLightHit
```


## Use DolphinLightIntersectAt

A complete small caller. Values are illustrative; check the returned result and package requirements before connecting live resources.

Verification: type checked

```yh
using dolphin.lightlab

// Build bounded lighting experiments with geometry, visibility, transport, film, and GPU/CPU contracts.
dolphinLightShape s = dolphinLightShape(1, 1, 1, 1, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0)
int index = 1
float ox = 1.0
float oy = 1.0
float oz = 1.0
float dx = 1.0
float dy = 1.0
float dz = 1.0
float maximum = 1.0
float time = 1.0
dolphinLightHit result = DolphinLightIntersectAt(s, index, ox, oy, oz, dx, dy, dz, maximum, time)
Console.Log("Inspect result in your debugger")

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.dolphin_lightlab__dolphinlightintersectat"
version = "0.1.0"
languageEdition = "yeho-core-2026.1"

[app]
kind = "headless"

[[dependencies]]
package = "dolphin.lightlab"
version = "0.1.0"
path = "../../../dolphin/packages/lightlab"

[[dependencies]]
package = "dolphin.materials"
version = "0.1.0"
path = "../../../dolphin/packages/materials"

[[dependencies]]
package = "dolphin.math"
version = "0.1.0"
path = "../../../dolphin/packages/math"

[[dependencies]]
package = "dolphin.spatial3d"
version = "0.1.0"
path = "../../../dolphin/packages/spatial3d"

```

Extract the example archive beside the yeho and dolphin checkouts. This example requires those source dependencies and a current developer compiler.

```sh
./yeho/build/dolphin-metal/yehoc ./api-examples/dolphin.lightlab--DolphinLightIntersectAt/usage --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


Package presence and a declaration do not establish support on every host. Host services need their platform and lifecycle setup.

Source: dolphin/packages/lightlab/src/lightlab.yh

AI training permission: https://demonhunterlabs.com/ai-use