> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ploterr.com/llms.txt
> Use this file to discover all available pages before exploring further.

# prepareProjectRasterViews

> prepareProjectRasterViews makes the images for the raster isometric views of a project.

Do this before you export a sheet that shows such a view.

## Import

```typescript theme={null}
import {
  prepareProjectRasterViews,
  createProjectRasterViewProvider,
  createProjectRasterViewResolver,
  isProjectRasterViewCurrent,
  ProjectRasterError,
} from '@opengeometry/floorkit';
```

## Example

```typescript theme={null}
import {
  prepareProjectRasterViews,
  isProjectRasterViewCurrent,
  exportProjectPdf,
  type ProjectFile,
  type RasterViewProvider,
} from '@opengeometry/floorkit';

export async function exportWithImages(
  project: ProjectFile,
  viewId: string,
  provider: RasterViewProvider,
): Promise<Blob> {
  const batch = await prepareProjectRasterViews(project, provider, { viewIds: [viewId], dpi: 300 });
  if (!isProjectRasterViewCurrent(project, viewId, batch)) {
    throw new Error('The model changed. Prepare the images again.');
  }
  return exportProjectPdf(project, undefined, { rasterViews: batch });
}
```

## Notes

* Give a provider that renders the image. `createProjectRasterViewProvider` makes one from your renderer.
* The image size follows the largest viewport that shows the view, and the DPI that you set.
* Prepare the images again after a change of the model, the view or the assets. A change of the sheet layout does not need new images.
* The export rejects a missing or old image with `ProjectRasterError`.
* For section and elevation images, use [`prepareProjectPhysicalRasterViews`](/floorkit/api/views/prepare-project-physical-raster-views).

## Signature

```typescript theme={null}
function prepareProjectRasterViews(
  project: ProjectFile,
  provider: RasterViewProvider,
  options?: PrepareProjectRasterViewsOptions,
): Promise<RasterViewBatch>;
```

## Parameters

<ParamField path="project" type="ProjectFile" required />

<ParamField path="provider" type="RasterViewProvider" required />

<ParamField path="options" type="PrepareProjectRasterViewsOptions">
  Default: `&#123;&#125;`.
</ParamField>

## Returns

```typescript theme={null}
Promise<RasterViewBatch>;
```

## createProjectRasterViewProvider

Render detached committed model inputs in a disposable scene using the app's renderer.

```typescript theme={null}
function createProjectRasterViewProvider(renderer: THREE.WebGLRenderer): RasterViewProvider;
```

## createProjectRasterViewResolver

Resolve prepared content, rejecting missing or stale raster images at call time.

```typescript theme={null}
function createProjectRasterViewResolver(
  project: ProjectFile,
  batch?: RasterViewBatch,
  options?: ProjectRasterViewOptions,
): (viewId: string) => RasterDrawing | undefined;
```

## isProjectRasterViewCurrent

Check current committed model/view/assets each time; placement changes do not stale pixels.

```typescript theme={null}
function isProjectRasterViewCurrent(
  project: ProjectFile,
  viewId: string,
  batch: RasterViewBatch,
  options?: ProjectRasterViewOptions,
): boolean;
```

## ProjectRasterError

Stable failure codes for preparation, rendering and stale sheet content.

```typescript theme={null}
class ProjectRasterError extends Error {
  readonly code: ProjectRasterErrorCode;
  readonly viewId: string;
  constructor(code: ProjectRasterErrorCode, viewId: string, message: string);
}
```

## Types

### RasterViewProvider

Apps supply browser/WebGL execution; importing Floorkit does not start a browser.

```typescript theme={null}
type RasterViewProvider = (
  request: RasterViewRequest,
) => RasterViewImage | Promise<RasterViewImage>;
```

### PrepareProjectRasterViewsOptions

```typescript theme={null}
interface PrepareProjectRasterViewsOptions extends ProjectRasterViewOptions {
  viewIds?: readonly string[];
  dpi?: number;
  pixelWidth?: number;
}
```

### RasterViewBatch

Derived images for sheet resolution.

```typescript theme={null}
interface RasterViewBatch {
  views: ReadonlyMap<string, PreparedRasterView>;
}
```

### ProjectRasterViewOptions

```typescript theme={null}
interface ProjectRasterViewOptions {
  assetSources?: BuildOptions['assetSources'];
  massColors?: BuildOptions['massColors'];
}
```

<ResponseField name="assetSources" type="BuildOptions['assetSources']" />

<ResponseField name="massColors" type="BuildOptions['massColors']">
  The colours of mass parts by use; see `BuildOptions.massColors`. Part of the identity.
</ResponseField>

### RasterDrawing

Derived PNG content with camera-plane bounds converted to paper's Y-down convention.

```typescript theme={null}
interface RasterDrawing {
  kind: 'raster';
  units: 'meters';
  src: string;
  pixelWidth: number;
  pixelHeight: number;
  bounds: {
    min: Point2;
    max: Point2;
  };
  overlay?: readonly DrawingPrimitive[];
}
```

<ResponseField name="kind" type="'raster'" required />

<ResponseField name="units" type="'meters'" required />

<ResponseField name="src" type="string" required />

<ResponseField name="pixelWidth" type="number" required />

<ResponseField name="pixelHeight" type="number" required />

<ResponseField
  name="bounds"
  type="{
min: Point2;
max: Point2;
}"
  required
/>

<ResponseField name="overlay" type="readonly DrawingPrimitive[]">
  Derived camera-plane vectors in metres, placed above pixels using the same fixed bounds.
</ResponseField>

### ProjectRasterErrorCode

```typescript theme={null}
type ProjectRasterErrorCode =
  | 'unknown-raster-view'
  | 'missing-raster-view'
  | 'stale-raster-view'
  | 'invalid-raster-image'
  | 'invalid-raster-size'
  | 'unknown-raster-element'
  | 'empty-raster-view';
```

### RasterViewRequest

Detached committed inputs.

```typescript theme={null}
interface RasterViewRequest {
  buildingModel: Readonly<BuildingModel>;
  view: Readonly<SavedRasterIsometricView>;
  pixelWidth: number;
  pixelHeight: number;
  sourceKey: string;
  assetSources?: BuildOptions['assetSources'];
  massColors?: BuildOptions['massColors'];
}
```

<ResponseField name="buildingModel" type="Readonly<BuildingModel>" required />

<ResponseField name="view" type="Readonly<SavedRasterIsometricView>" required />

<ResponseField name="pixelWidth" type="number" required />

<ResponseField name="pixelHeight" type="number" required />

<ResponseField name="sourceKey" type="string" required>
  Exact model/view/asset input identity, issued by preparation and echoed by the provider.
</ResponseField>

<ResponseField name="assetSources" type="BuildOptions['assetSources']" />

<ResponseField name="massColors" type="BuildOptions['massColors']">
  The colours of mass parts by use; see `BuildOptions.massColors`.
</ResponseField>

### RasterViewImage

Encoded browser rendering.

```typescript theme={null}
interface RasterViewImage {
  src: string;
  pixelWidth: number;
  pixelHeight: number;
  sourceKey: string;
}
```

### PreparedRasterView

```typescript theme={null}
interface PreparedRasterView {
  sourceKey: string;
  drawing: RasterDrawing;
}
```

## Related

* [`BuildingModel`](/floorkit/api/architecture/validate-building-model#buildingmodel)
* [`BuildOptions`](/floorkit/api/architecture/build-from-building-model#buildoptions)
* [`DrawingPrimitive`](/floorkit/api/drawings/draw-project-view#drawingprimitive)
* [`Point2`](/floorkit/api/annotations/dimension-geometry#point2)
* [`ProjectFile`](/floorkit/api/exports/project-file#projectfile)
* [`SavedRasterIsometricView`](/floorkit/api/drawings/sheet-documents#savedrasterisometricview)


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