# SetGraphics3DSunShadowMatrixElementV1

The matrix is a column-major directional-light view-projection matrix. The current model matrix remains per-draw state shared with the lit profile.

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 SetGraphics3DSunShadowMatrixElementV1(int shadow, int element, float value) returns bool
```


## Use SetGraphics3DSunShadowMatrixElementV1

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.
int shadow = 1
int element = 1
float value = 1.0
bool result = SetGraphics3DSunShadowMatrixElementV1(shadow, element, value)
Console.Log(Text.From(result))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.graphics_render3d__setgraphics3dsunshadowmatrixelementv1"
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--SetGraphics3DSunShadowMatrixElementV1/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