Replacing textures rather than materials

This topic has 76 replies, 10 voices, and was last updated 5 years, 8 months ago by Yuri Kovelenov.

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2018-03-29 at 7:25 pm #3273

johngrigni
Customer

OK, so I got them to load, from the icons, but the UV problem is still there.

2018-03-30 at 8:41 am #3278

Yuri Kovelenov
Staff

Hi,
if you try to assign a texture in Blender, does it properly UVmapped?

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2018-03-30 at 12:36 pm #3287

johngrigni
Customer

Yes, the starting cube is UV unwrapped, and both textures in the material are assigned UV. The cube comes through fine when you launch it, but when you click an icon to load a texture (either diffuse or normal), it’s like the material just forgets the UV mapping for both.

2018-03-30 at 2:50 pm #3307

Yuri Kovelenov
Staff

Can you please attach the project? We’d like to take a deeper look into this issue.

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2018-03-30 at 2:57 pm #3309

johngrigni
Customer

Here is a zip of the folder from the application folder

2018-03-30 at 2:58 pm #3312

johngrigni
Customer

And I’d like to say thank you for this help. I’m trying to get a client interested, and this is a requirement of the project.

2018-03-30 at 4:23 pm #3319

Yuri Kovelenov
Staff

No worries. I was able to make it work by creating a new cube from scratch. I still don’t understand the reason why it doesn’t work in your case

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2018-03-30 at 4:30 pm #3321

johngrigni
Customer

I have a theory, looking at your UV map and mine – mine extends past the edges of the ‘live area’ – which is not a problem in Blender since it just wraps around. Just a guess, and thank you very much! That was driving me nuts!

2018-03-30 at 4:34 pm #3322
Yuri Kovelenov
Staff
I think I figured it out – instead of creating a new texture, we can simply replace its image:
```
function prepareExternalInterface(app) {
    // register functions in the app.ExternalInterface to call them from Puzzles, e.g:
    // app.ExternalInterface.myJSFunction = function() {
    //     console.log('Hello, World!');
    // }
	app.ExternalInterface.changeTexture = function(objName, diffuseURL, normalURL) {
        app.scene.traverse(function(obj){
            if (obj.name == objName) {

                var loader = new v3d.ImageLoader();
                loader.load(diffuseURL, function(image) { 
                    obj.material.map.image = image;
                    obj.material.map.needsUpdate = true;
                })
                loader.load(normalURL, function(image) { 
                    obj.material.normalMap.image = image;
                    obj.material.normalMap.needsUpdate = true;
                })      
            }
        });
    }
}
```
It now works! :)

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2018-04-05 at 2:07 pm #3396

johngrigni
Customer

I’ve run into a problem, in that this changes the texture for every object in the scene that uses that texture, even if it has a different material. I plan to have at least 5 objects that would be swappable, do I need five different versions of each texture? I thought the objName parameter would mean that it only gets swapped for that object, as opposed to across the scene.

In the example, even the leftmost icons get the texture swapped out for the monkey head or gradient, though the other icons don’t.

2018-04-05 at 2:21 pm #3397

Yuri Kovelenov
Staff

Hi,
You can avoid this behavior by unsharing an image in Blender: just click the numbered button to make a copy.

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2018-04-05 at 3:12 pm #3400

johngrigni
Customer

I thought it might be that simple! Thank you. But now I’m up against a different question:

Let’s say the user has set the diffuse texture of several objects:
1 – blue/monkey
2 – green/monkey
3 – red/monkey

The variable for the diffuse texture is still the last one set, ‘red’, so if I go to change the normal texture of object 1 to ‘torus’, it will set the diffuse to ‘red’, so I get red/torus when I want it to be blue/torus.

I’m thinking the simplest solution is to separate the diffuse and normal changeTexture into separate functions: changeDiffuse and changeNormal, and simply delete the part that changes the other image in each one.

Alternately, when I select the object, have it reset the diffuse and normal variables to whatever the current values are for the object. But I’m not sure how to get that value out of the object, so I’m leaning towards the first one.

What would you suggest?

2018-04-05 at 4:13 pm #3403

Yuri Kovelenov
Staff

Yep, the first way looks more optimal since it touches just one texture.

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2018-04-05 at 4:19 pm #3404

johngrigni
Customer

I went ahead with that, and it seems to work. Given that I’m still very much a noob with coding, I’m feeling very good about myself for making it work. Thanks again for all your help!

2018-04-05 at 4:28 pm #3405

Yuri Kovelenov
Staff

Sure. Glad you enjoy Verge3D! :)

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