Implement API to change model colors about android-3d-model-viewer HOT 18 CLOSED

Hi. If you want to paint yourself the model programmatically, you would have to parse the groups of the model and save it on the Object3DData. Then you will be able to paint them independently, with material or any color.

So, in order to save the groups for later processing, you need at least a structure like this:

IdGroup : gasoline_tank
vertexList:1,2,30,41,1000,etc

IdGroup:. wheels
vertexList:. 23,24,80,2000,etc

With that structure you can populate arrayVertexColorBuffer object.

from android-3d-model-viewer.

Hi, Replace the setColor function in Object3DData.java like this:

public Object3DData setColor(float[] color) {
    // color variable when using single color
	this.color = color;
	
	// color buffer when using multiple colors
	if (this.vertexColorsArrayBuffer != null && this.vertexColorsArrayBuffer.capacity() > 0){
		for (int i=0; i<vertexColorsArrayBuffer.capacity(); i+=4){
			vertexColorsArrayBuffer.put(i,color[0]);
                            vertexColorsArrayBuffer.put(i+1,color[1]);
                            vertexColorsArrayBuffer.put(i+2,color[2]);
                            vertexColorsArrayBuffer.put(i+3,color[3]);
		}
	}
	return this;
}

Then call

obj.setColor(new float[] { 1f, 0f, 1f, 1f });

from android-3d-model-viewer.

Hi. If you want to paint yourself the model programmatically, you would have to parse the groups of the model and save it on the Object3DData. Then you will be able to paint them independently, with material or any color.

So, in order to save the groups for later processing, you need at least a structure like this:

IdGroup : gasoline_tank
vertexList:1,2,30,41,1000,etc

IdGroup:. wheels
vertexList:. 23,24,80,2000,etc

With that structure you can populate arrayVertexColorBuffer object.

Hi. Ok, so that means i need to modify the WavefrontLoader class in the readModel method for parse the group over 'o' rigth?

from android-3d-model-viewer.

Hi ritup. Are you trying to load ToyPlane.obj from external SD card? If so, please attach the log to see what error you have. KR

from android-3d-model-viewer.

No I am not having error
It shows green color in app & in online site it shows orange color

from android-3d-model-viewer.

from android-3d-model-viewer.

from android-3d-model-viewer.

Hey. Not sure to understand your last question. What API? The different Kd colors are linked to the different parts of the 3d obj file.

In the ToyModel example you have 3 colors only and a texture.

from android-3d-model-viewer.

from android-3d-model-viewer.

hi @ritup22 not sure to understand. are you trying to change the colors of the loaded model in your app?
regards

from android-3d-model-viewer.

from android-3d-model-viewer.

Hey. The change colors feature is not implemented.
If you want to do it yourself, you would have to post process the materials in Object3DData.java
Here is were the colors are generated for 3D Object3DBuilder.java#L515
I am chaning the title of this issue to "Implement API to change model colors"

from android-3d-model-viewer.

Hi,
I am also getting the same issue. When I am loading a model, it's color is changing. The original color of the model is white but when I am loading the model its color is changing to green.

from android-3d-model-viewer.

Hi @andresoviedo,

I am also trying to implement this feature. I founded where can we change the material (in my case) attached to the obj but this is not showing when the object is already created and showing, i guess i need to refresh the scene or something...

How can i re-build or re-read the object to showing the changes?

Regards

from android-3d-model-viewer.

// color buffer when using multiple colors
if (this.vertexColorsArrayBuffer != null && this.vertexColorsArrayBuffer.capacity() > 0){
for (int i=0; i<vertexColorsArrayBuffer.capacity(); i+=4){
vertexColorsArrayBuffer.put(i,color[0]);
vertexColorsArrayBuffer.put(i+1,color[1]);
vertexColorsArrayBuffer.put(i+2,color[2]);
vertexColorsArrayBuffer.put(i+3,color[3]);
}
}

Thanks for the answer. It works fine but this code paint all the object to the specified color. Is there any way to set the color to specified material? This is the code what i've works on

obj.materials.materials["Material.003"]?.kd = WavefrontLoader.Tuple3(0.0f, 0.0f, 0.0f)

obtaining the material and set the color to it.

->

from android-3d-model-viewer.

@sk8dar yes. You would need to:

• extend Object3DData with a Map<String,IntBuffer>
• improve Wavefrontloader to parse groups.

Regards

from android-3d-model-viewer.

API has the method Oject3DData.setColor(float[]) available.

from android-3d-model-viewer.

Hi. If you want to paint yourself the model programmatically, you would have to parse the groups of the model and save it on the Object3DData. Then you will be able to paint them independently, with material or any color.
So, in order to save the groups for later processing, you need at least a structure like this:

IdGroup : gasoline_tank
vertexList:1,2,30,41,1000,etc

IdGroup:. wheels
vertexList:. 23,24,80,2000,etc

With that structure you can populate arrayVertexColorBuffer object.

Hi. Ok, so that means i need to modify the WavefrontLoader class in the readModel method for parse the group over 'o' rigth?

Hello you this group of different color inside implements, please can you help me, I need your demo

from android-3d-model-viewer.