Camera

Introduction

This class is not intended for general use. Please use the
similarly named class under Rendering/Core. This class is
a WebGL implementation of that generic renderable class in
Rendering Core. This class will automatically get instantiated
and rendered as needed by the OpenGLRenderWindow.

Source

index.js
import { mat3, mat4 } from 'gl-matrix';

import * as macro from 'vtk.js/Sources/macros';
import vtkViewNode from 'vtk.js/Sources/Rendering/SceneGraph/ViewNode';

import { registerOverride } from 'vtk.js/Sources/Rendering/OpenGL/ViewNodeFactory';

// ----------------------------------------------------------------------------
// vtkOpenGLCamera methods
// ----------------------------------------------------------------------------

function vtkOpenGLCamera(publicAPI, model) {
// Set our className
model.classHierarchy.push('vtkOpenGLCamera');

publicAPI.buildPass = (prepass) => {
if (prepass) {
model.openGLRenderer =
publicAPI.getFirstAncestorOfType('vtkOpenGLRenderer');
model._openGLRenderWindow = model.openGLRenderer.getParent();
model.context = model._openGLRenderWindow.getContext();
}
};

// Renders myself
publicAPI.opaquePass = (prepass) => {
if (prepass) {
const tsize = model.openGLRenderer.getTiledSizeAndOrigin();
model.context.viewport(
tsize.lowerLeftU,
tsize.lowerLeftV,
tsize.usize,
tsize.vsize
);
model.context.scissor(
tsize.lowerLeftU,
tsize.lowerLeftV,
tsize.usize,
tsize.vsize
);
}
};
publicAPI.translucentPass = publicAPI.opaquePass;
publicAPI.opaqueZBufferPass = publicAPI.opaquePass;
publicAPI.volumePass = publicAPI.opaquePass;

publicAPI.getKeyMatrices = (ren) => {
// has the camera changed?
if (
ren !== model.lastRenderer ||
model._openGLRenderWindow.getMTime() > model.keyMatrixTime.getMTime() ||
publicAPI.getMTime() > model.keyMatrixTime.getMTime() ||
ren.getMTime() > model.keyMatrixTime.getMTime() ||
model.renderable.getMTime() > model.keyMatrixTime.getMTime()
) {
mat4.copy(model.keyMatrices.wcvc, model.renderable.getViewMatrix());

mat3.fromMat4(model.keyMatrices.normalMatrix, model.keyMatrices.wcvc);
mat3.invert(
model.keyMatrices.normalMatrix,
model.keyMatrices.normalMatrix
);
mat4.transpose(model.keyMatrices.wcvc, model.keyMatrices.wcvc);

const aspectRatio = model.openGLRenderer.getAspectRatio();

mat4.copy(
model.keyMatrices.vcpc,
model.renderable.getProjectionMatrix(aspectRatio, -1, 1)
);
mat4.transpose(model.keyMatrices.vcpc, model.keyMatrices.vcpc);

mat4.multiply(
model.keyMatrices.wcpc,
model.keyMatrices.vcpc,
model.keyMatrices.wcvc
);

model.keyMatrixTime.modified();
model.lastRenderer = ren;
}

return model.keyMatrices;
};
}

// ----------------------------------------------------------------------------
// Object factory
// ----------------------------------------------------------------------------

const DEFAULT_VALUES = {
context: null,
lastRenderer: null,
keyMatrixTime: null,
keyMatrices: null,
};

// ----------------------------------------------------------------------------

export function extend(publicAPI, model, initialValues = {}) {
Object.assign(model, DEFAULT_VALUES, initialValues);

// Inheritance
vtkViewNode.extend(publicAPI, model, initialValues);

model.keyMatrixTime = {};
macro.obj(model.keyMatrixTime);

// values always get set by the get method
model.keyMatrices = {
normalMatrix: new Float64Array(9),
vcpc: new Float64Array(16),
wcvc: new Float64Array(16),
wcpc: new Float64Array(16),
};

// Build VTK API
macro.setGet(publicAPI, model, ['context', 'keyMatrixTime']);

// Object methods
vtkOpenGLCamera(publicAPI, model);
}

// ----------------------------------------------------------------------------

export const newInstance = macro.newInstance(extend);

// ----------------------------------------------------------------------------

export default { newInstance, extend };

// Register ourself to OpenGL backend if imported
registerOverride('vtkCamera', newInstance);