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createTangentSpaceDebugPrimitive.js
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createTangentSpaceDebugPrimitive.js
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define([
'../Core/ColorGeometryInstanceAttribute',
'../Core/defaultValue',
'../Core/defined',
'../Core/DeveloperError',
'../Core/GeometryInstance',
'../Core/GeometryPipeline',
'../Core/Matrix4',
'./PerInstanceColorAppearance',
'./Primitive'
], function(
ColorGeometryInstanceAttribute,
defaultValue,
defined,
DeveloperError,
GeometryInstance,
GeometryPipeline,
Matrix4,
PerInstanceColorAppearance,
Primitive) {
'use strict';
/**
* Creates a {@link Primitive} to visualize well-known vector vertex attributes:
* <code>normal</code>, <code>tangent</code>, and <code>bitangent</code>. Normal
* is red; tangent is green; and bitangent is blue. If an attribute is not
* present, it is not drawn.
*
* @exports createTangentSpaceDebugPrimitive
*
* @param {Object} options Object with the following properties:
* @param {Geometry} options.geometry The <code>Geometry</code> instance with the attribute.
* @param {Number} [options.length=10000.0] The length of each line segment in meters. This can be negative to point the vector in the opposite direction.
* @param {Matrix4} [options.modelMatrix=Matrix4.IDENTITY] The model matrix that transforms to transform the geometry from model to world coordinates.
* @returns {Primitive} A new <code>Primitive</code> instance with geometry for the vectors.
*
* @example
* scene.primitives.add(Cesium.createTangentSpaceDebugPrimitive({
* geometry : instance.geometry,
* length : 100000.0,
* modelMatrix : instance.modelMatrix
* }));
*/
function createTangentSpaceDebugPrimitive(options) {
options = defaultValue(options, defaultValue.EMPTY_OBJECT);
var instances = [];
var geometry = options.geometry;
//>>includeStart('debug', pragmas.debug);
if (!defined(geometry)) {
throw new DeveloperError('options.geometry is required.');
}
//>>includeEnd('debug');
if (!defined(geometry.attributes) || !defined(geometry.primitiveType)) {
// to create the debug lines, we need the computed attributes.
// compute them if they are undefined.
geometry = geometry.constructor.createGeometry(geometry);
}
var attributes = geometry.attributes;
var modelMatrix = Matrix4.clone(defaultValue(options.modelMatrix, Matrix4.IDENTITY));
var length = defaultValue(options.length, 10000.0);
if (defined(attributes.normal)) {
instances.push(new GeometryInstance({
geometry : GeometryPipeline.createLineSegmentsForVectors(geometry, 'normal', length),
attributes : {
color : new ColorGeometryInstanceAttribute(1.0, 0.0, 0.0, 1.0)
},
modelMatrix : modelMatrix
}));
}
if (defined(attributes.tangent)) {
instances.push(new GeometryInstance({
geometry : GeometryPipeline.createLineSegmentsForVectors(geometry, 'tangent', length),
attributes : {
color : new ColorGeometryInstanceAttribute(0.0, 1.0, 0.0, 1.0)
},
modelMatrix : modelMatrix
}));
}
if (defined(attributes.bitangent)) {
instances.push(new GeometryInstance({
geometry : GeometryPipeline.createLineSegmentsForVectors(geometry, 'bitangent', length),
attributes : {
color : new ColorGeometryInstanceAttribute(0.0, 0.0, 1.0, 1.0)
},
modelMatrix : modelMatrix
}));
}
if (instances.length > 0) {
return new Primitive({
asynchronous : false,
geometryInstances : instances,
appearance : new PerInstanceColorAppearance({
flat : true,
translucent : false
})
});
}
return undefined;
}
return createTangentSpaceDebugPrimitive;
});