Merge pull request #183 from KhronosGroup/fix-no-image-reference

Don't make textures if there is no image backing it

Author: lasalvavida

CHANGES.md

@@ -6,6 +6,7 @@ Change Log
 ##### Fixes :wrench:
 * Upgrade to Draco 1.2.5 [#179](https://github.com/KhronosGroup/COLLADA2GLTF/pull/179)
 * Fix issue with exporting normal maps [#182](https://github.com/KhronosGroup/COLLADA2GLTF/pull/182)
+* Fix issue with COLLADA textures with no backing image [#183](https://github.com/KhronosGroup/COLLADA2GLTF/pull/183)
 
 ### v2.1.1 - 2018-04-04
 

src/COLLADA2GLTFWriter.cpp

@@ -883,10 +883,15 @@ void packColladaColor(COLLADAFW::Color color, float* packArray) {
 }
 
 GLTF::Texture* COLLADA2GLTF::Writer::fromColladaTexture(const COLLADAFW::EffectCommon* effectCommon, COLLADAFW::SamplerID samplerId) {
-	GLTF::Texture* texture = new GLTF::Texture();
 	const COLLADAFW::SamplerPointerArray& samplers = effectCommon->getSamplerPointerArray();
 	COLLADAFW::Sampler* colladaSampler = (COLLADAFW::Sampler*)samplers[samplerId];
-	GLTF::Image* image = _images[colladaSampler->getSourceImage()];
+	std::map<COLLADAFW::UniqueId, GLTF::Image*>::iterator findImage = _images.find(colladaSampler->getSourceImage());
+	if (findImage == _images.end()) {
+		return NULL;
+	}
+	GLTF::Texture* texture = new GLTF::Texture();
+	GLTF::Image* image = findImage->second;
+
 	texture->source = image;
 	texture->sampler = _asset->globalSampler;
 	return texture;