[Solved] Blender exporter: loss of Texture

Hello.

I guess my question has been already answered before explicitly or between the lines,
but the answers read did not help me…

So I want to export a blend file – a plant, which leaves are actually mostly green, and the green Texture gets even exported, however all I see when loading the exported model with

    Node* plantNode = scene_->CreateChild("Plant");
    plantNode->SetScale(20);    
    plantNode->SetPosition(Vector3(50.0f, 0.0f, 50.0f));
    StaticModel* plantObject = plantNode->CreateComponent<StaticModel>();
    plantObject->SetModel(cache->GetResource<Model>("Models/Plant.mdl"));
    plantObject->ApplyMaterialList("Materials/Plant.txt");

is a plant with black leaves as if the exported green texture were not properly recognized.

The only material exported was:

<material>
	<technique name="Techniques/DiffNormalSpec.xml"/>
	<texture name="Textures/bpng_Schwaz_wei_sten.png" unit="diffuse"/>
	<texture name="Textures/bpng_NRM Kopie.jpg" unit="normal"/>
	<texture name="Textures/bpng.jpg" unit="specular"/>
	<parameter name="MatDiffColor" value="0.133919 0.245904 0.0451157 1"/>
	<parameter name="MatSpecColor" value="0.105814 0.105814 0.105814 19"/>
	<cull value="none"/>
	<shadowcull value="none"/>
</material>

What to do?

Under the export options check the Geometries -> Tangent box. This is required when using normal maps.

Did that, but it did not help.
Still black leaves in Urho3d:

And no errors? Could not find resource, for instance?

Well, I do not see error messages in the log, but

Used resources:
Textures/Ramp.png
Textures/Spot.png
Textures/UI.png
Textures/cps_logo.png
Textures/Grids/gridBlue+512_25.png
Textures/Test_Image_3.jpg
Textures/Test_Image_4.jpg
Techniques/NoTexture.xml
Techniques/Diff.xml
RenderPaths/Forward.xml
UI/DefaultStyle.xml
Config/sliders.xml
PostProcess/Bloom.xml
PostProcess/FXAA2.xml
Textures/UrhoIcon.png
Textures/UI.png
Fonts/Anonymous Pro.ttf
Shaders/HLSL/Basic.hlsl
Shaders/HLSL/LitSolid.hlsl
Shaders/HLSL/Shadow.hlsl
Shaders/HLSL/Bloom.hlsl
Shaders/HLSL/ClearFramebuffer.hlsl
Models/Plane.mdl
Models/Plant.mdl
Models/Jack.mdl
Materials/Grids/GridBlue+.xml
Materials/BackPlane.xml
Materials/LeftPlane.xml
Materials/Jack.xml
Models/Jack_Walk.ani

mentions only Models/Plant.mdl, textures or materials of Plant.mdl are not mentioned as if they were not searched for at all.

Are the contents of the material list Plant.txt as expected?

Yes, they are. For instance:

Materials/Topf.xml
Materials/Erde.xml
Materials/Material.036.xml

Isn’t it in your Models folder?

Good hint. Moved Plant.txt from Models to Materials.
Now the log says:

Used resources:
Textures/Ramp.png
Textures/Spot.png
Textures/UI.png
Textures/cps_logo.png
Textures/Grids/gridBlue+512_25.png
Textures/Test_Image_3.jpg
Textures/Test_Image_4.jpg
Textures/Teppich512X512_NRM.jpg
Textures/Kies_NRM.jpg
Textures/bpng_Schwaz_wei_sten.png
Textures/bpng_NRM Kopie.jpg
Textures/bpng.jpg
Techniques/NoTexture.xml
Techniques/Diff.xml
Techniques/DiffNormal.xml
Techniques/DiffNormalSpec.xml
RenderPaths/Forward.xml
UI/DefaultStyle.xml
Config/sliders.xml
PostProcess/Bloom.xml
PostProcess/FXAA2.xml
Textures/UrhoIcon.png
Textures/UI.png
Fonts/Anonymous Pro.ttf
Shaders/HLSL/Basic.hlsl
Shaders/HLSL/LitSolid.hlsl
Shaders/HLSL/Shadow.hlsl
Shaders/HLSL/Bloom.hlsl
Shaders/HLSL/ClearFramebuffer.hlsl
Models/Plane.mdl
Models/Plant.mdl
Models/Jack.mdl
Materials/Grids/GridBlue+.xml
Materials/BackPlane.xml
Materials/LeftPlane.xml
Materials/Topf.xml
Materials/Erde.xml
Materials/Material.036.xml
Materials/Jack.xml
Models/Jack_Walk.ani

which means all Plant materials and textures are found.

After zooming in, one can see some green textures

but this is still so far from the green of the original blend file.

Ok changing something about Material.036.xml helped:

<material>
	<technique name="Techniques/DiffNormal.xml"/>
	<!--texture name="Textures/bpng_Schwaz_wei_sten.png" unit="diffuse"/-->
	<!--texture name="Textures/bpng_NRM Kopie.jpg" unit="normal"/-->
	<texture name="Textures/bpng.jpg" unit="specular"/>
	<parameter name="MatDiffColor" value="0.133919 0.945904 0.0451157 1"/>
	<!--parameter name="MatSpecColor" value="0.105814 0.105814 0.105814 19"/-->
	<cull value="none"/>
	<shadowcull value="none"/>
</material>

You made your plant emit green. You disabled both normal and diffuse. Is it fine with you?

As before my plant seemed to be mostly black, this “solution” was an improvement for me.
But I am open fro any better proposals.

I think you could try Diff technique first and try with only “diffuse” texture and color to get closer to required effect, then attach normal (DiffNormal). You can use a little bit of specularity, but that is secondary factor, your plant should be green even without specularity, if enough light source applied.