pybevy 0.2.1

PyBevy: A Python Real-Time Engine Built on Bevy
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"""Shows various ways to configure texture materials in 3D.

Demonstrates:
- Loading textures with AssetServer
- StandardMaterial with base_color_texture
- AlphaMode for transparency
- Color modulation of textures
- Rectangle mesh for quads
- Transform rotation and positioning
"""

import math

from pybevy.prelude import *


def setup(
    commands: Commands,
    asset_server: Res[AssetServer],
    meshes: ResMut[Assets[Mesh]],
    materials: ResMut[Assets[StandardMaterial]],
) -> None:
    """Set up scene with textured entities."""
    # Load texture (using bevy_bird_dark.png as a substitute for bevy_logo_dark_big.png)
    texture_handle = asset_server.load_image("bevy/branding/bevy_bird_dark.png")
    aspect = 0.25

    # Create a quad mesh
    quad_width = 8.0
    quad_handle = meshes.add(Rectangle(quad_width, quad_width * aspect).mesh())

    # Normal texture material
    material_handle = materials.add(
        StandardMaterial(
            base_color_texture=texture_handle,
            alpha_mode=AlphaMode.Blend(),
            unlit=True,
        )
    )

    # Red modulated texture material
    red_material_handle = materials.add(
        StandardMaterial(
            base_color=Color.srgba(1.0, 0.0, 0.0, 0.5),
            base_color_texture=texture_handle,
            alpha_mode=AlphaMode.Blend(),
            unlit=True,
        )
    )

    # Blue modulated texture material
    blue_material_handle = materials.add(
        StandardMaterial(
            base_color=Color.srgba(0.0, 0.0, 1.0, 0.5),
            base_color_texture=texture_handle,
            alpha_mode=AlphaMode.Blend(),
            unlit=True,
        )
    )

    # Textured quad - normal
    commands.spawn(
        Mesh3d(quad_handle),
        MeshMaterial3d(material_handle),
        Transform.from_xyz(0.0, 0.0, 1.5).with_rotation(
            Quat.from_rotation_x(-math.pi / 5.0)
        ),
    )

    # Textured quad - red modulated
    commands.spawn(
        Mesh3d(quad_handle),
        MeshMaterial3d(red_material_handle),
        Transform.from_rotation(Quat.from_rotation_x(-math.pi / 5.0)),
    )

    # Textured quad - blue modulated
    commands.spawn(
        Mesh3d(quad_handle),
        MeshMaterial3d(blue_material_handle),
        Transform.from_xyz(0.0, 0.0, -1.5).with_rotation(
            Quat.from_rotation_x(-math.pi / 5.0)
        ),
    )

    # Camera
    commands.spawn(
        Camera3d(),
        Transform.from_xyz(3.0, 5.0, 8.0).looking_at(Vec3.ZERO, Vec3.Y),
    )


@entrypoint
def main(app: App) -> App:
    return app.add_plugins(DefaultPlugins).add_systems(Startup, setup)


if __name__ == "__main__":
    main().run()