GLTFExporter: Introduce options maxTextureWidth and maxTextureHeight.

docs/examples/en/exporters/GLTFExporter.html

@@ -94,6 +94,7 @@
 			<li>truncateDrawRange - bool. Export just the attributes within the drawRange, if defined, instead of exporting the whole array. Default is true.</li>
 			<li>binary - bool. Export in binary (.glb) format, returning an ArrayBuffer. Default is false.</li>
 			<li>embedImages - bool. Export with images embedded into the glTF asset. Default is true.</li>
+			<li>maxTextureSize - int. Restricts the image maximum size (both width and height) to the given value. This option works only if embedImages is true. Default is Infinity.</li>
 			<li>animations - Array<[page:AnimationClip AnimationClip]>. List of animations to be included in the export.</li>
 			<li>forceIndices - bool. Generate indices for non-index geometry and export with them. Default is false.</li>
 			<li>forcePowerOfTwoTextures - bool. Export with images resized to POT size. This option works only if embedImages is true. Default is false.</li>

docs/examples/zh/exporters/GLTFExporter.html

@@ -94,6 +94,7 @@
 			<li>truncateDrawRange - bool. Export just the attributes within the drawRange, if defined, instead of exporting the whole array. Default is true.</li>
 			<li>binary - bool. Export in binary (.glb) format, returning an ArrayBuffer. Default is false.</li>
 			<li>embedImages - bool. Export with images embedded into the glTF asset. Default is true.</li>
+			<li>maxTextureSize - int. Restricts the image maximum size (both width and height) to the given value. This option works only if embedImages is true. Default is Infinity.</li>
 			<li>animations - Array<[page:AnimationClip AnimationClip]>. List of animations to be included in the export.</li>
 			<li>forceIndices - bool. Generate indices for non-index geometry and export with them. Default is false.</li>
 			<li>forcePowerOfTwoTextures - bool. Export with images resized to POT size. This option works only if embedImages is true. Default is false.</li>

examples/js/exporters/GLTFExporter.js

@@ -78,6 +78,7 @@ THREE.GLTFExporter.prototype = {
 			onlyVisible: true,
 			truncateDrawRange: true,
 			embedImages: true,
+			maxTextureSize: Infinity,
 			animations: [],
 			forceIndices: false,
 			forcePowerOfTwoTextures: false,
@@ -751,10 +752,10 @@ THREE.GLTFExporter.prototype = {
 
 				var canvas = cachedCanvas = cachedCanvas || document.createElement( 'canvas' );
 
-				canvas.width = image.width;
-				canvas.height = image.height;
+				canvas.width = Math.min( image.width, options.maxTextureSize );
+				canvas.height = Math.min( image.height, options.maxTextureSize );
 
-				if ( options.forcePowerOfTwoTextures && ! isPowerOfTwo( image ) ) {
+				if ( options.forcePowerOfTwoTextures && ! isPowerOfTwo( canvas ) ) {
 
 					console.warn( 'GLTFExporter: Resized non-power-of-two image.', image );
 

examples/jsm/exporters/GLTFExporter.js

@@ -102,6 +102,7 @@ GLTFExporter.prototype = {
 			onlyVisible: true,
 			truncateDrawRange: true,
 			embedImages: true,
+			maxTextureSize: Infinity,
 			animations: [],
 			forceIndices: false,
 			forcePowerOfTwoTextures: false,
@@ -775,10 +776,10 @@ GLTFExporter.prototype = {
 
 				var canvas = cachedCanvas = cachedCanvas || document.createElement( 'canvas' );
 
-				canvas.width = image.width;
-				canvas.height = image.height;
+				canvas.width = Math.min( image.width, options.maxTextureSize );
+				canvas.height = Math.min( image.height, options.maxTextureSize );
 
-				if ( options.forcePowerOfTwoTextures && ! isPowerOfTwo( image ) ) {
+				if ( options.forcePowerOfTwoTextures && ! isPowerOfTwo( canvas ) ) {
 
 					console.warn( 'GLTFExporter: Resized non-power-of-two image.', image );
 

examples/misc_exporter_gltf.html

@@ -22,6 +22,7 @@
 			<label><input id="option_binary" name="visible" type="checkbox">Binary (<code>.glb</code>)</label>
 			<label><input id="option_forceindices" name="visible" type="checkbox">Force indices</label>
 			<label><input id="option_forcepot" name="visible" type="checkbox">Force POT textures</label>
+			<label><input id="option_maxsize" name="maxSize" type="number" value="4096" min="2" max="8192" step="1"> Max texture size</label>
 		</div>
 
 		<script type="module">
@@ -41,7 +42,8 @@
 					truncateDrawRange: document.getElementById( 'option_drawrange' ).checked,
 					binary: document.getElementById( 'option_binary' ).checked,
 					forceIndices: document.getElementById( 'option_forceindices' ).checked,
-					forcePowerOfTwoTextures: document.getElementById( 'option_forcepot' ).checked
+					forcePowerOfTwoTextures: document.getElementById( 'option_forcepot' ).checked,
+					maxTextureSize: Number( document.getElementById( 'option_maxsize' ).value ) || Infinity // To prevent NaN value
 				};
 				gltfExporter.parse( input, function ( result ) {