# SetGraphics3DSunLightV1

Colors are bounded to 0..1. Intensity is bounded to 0..4 and is folded into the sun contribution once when configured, not recalculated by applications or exposed as provider state. Direction remains owned by SetGraphics3DLightDirection.

Last updated: 2026-09-09

Package: graphics.render3d | Status: source-declared

Tags: cpu, function, graphics, graphics.render3d, render3d, source-example, yeho

Use bounded hardware 3D resources, meshes, cameras, lights, and draw commands.

```yh
external SetGraphics3DSunLightV1(float red, float green, float blue, float intensity) returns bool
```


## Use SetGraphics3DSunLightV1

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

Verification: type checked

```yh
using graphics.render3d

// Use bounded hardware 3D resources, meshes, cameras, lights, and draw commands.
float red = 1.0
float green = 1.0
float blue = 1.0
float intensity = 1.0
bool result = SetGraphics3DSunLightV1(red, green, blue, intensity)
Console.Log(Text.From(result))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.graphics_render3d__setgraphics3dsunlightv1"
version = "0.1.0"
languageEdition = "yeho-core-2026.1"

[app]
kind = "headless"

[[dependencies]]
package = "graphics.render3d"
version = "0.1.0"
path = "../../../yeho/packages/graphics/render3d"

```

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/graphics.render3d--SetGraphics3DSunLightV1/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: yeho/packages/graphics/render3d/render3d.yh

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