Add a texture on a sphere by Urhosharp - xamarin

Question

I'm using Xamarin.Forms + Urhosharp, I've got a problem to set texture from an image on a sphere. The problem is that texture.Load or texture.SetData always returns false. I did try different methods like SetData, Load, resize texture and image (to a power of 2 number) and ... but none of them worked. Here is my code:
private async void CreateScene()
{
Input.SubscribeToTouchEnd(OnTouched);
_scene = new Scene();
_octree = _scene.CreateComponent<Octree>();
_plotNode = _scene.CreateChild();
var baseNode = _plotNode.CreateChild().CreateChild();
var plane = baseNode.CreateComponent<StaticModel>();
plane.Model = CoreAssets.Models.Sphere;
var cameraNode = _scene.CreateChild();
_camera = cameraNode.CreateComponent<Camera>();
cameraNode.Position = new Vector3(10, 15, 10) / 1.75f;
cameraNode.Rotation = new Quaternion(-0.121f, 0.878f, -0.305f, -0.35f);
Node lightNode = cameraNode.CreateChild();
var light = lightNode.CreateComponent<Light>();
light.LightType = LightType.Point;
light.Range = 100;
light.Brightness = 1.3f;
int size = 3;
baseNode.Scale = new Vector3(size * 1.5f, 1, size * 1.5f);
var imageStream = await new HttpClient().GetStreamAsync("some 512 * 512 jpg image");
var ms = new MemoryStream();
imageStream.CopyTo(ms);
var image = new Image();
var isLoaded = image.Load(new MemoryBuffer(ms));
if (!isLoaded)
{
throw new Exception();
}
var texture = new Texture2D();
//var isTextureLoaded = texture.Load(new MemoryBuffer(ms.ToArray()));
var isTextureLoaded = texture.SetData(image);
if (!isTextureLoaded)
{
throw new Exception();
}
var material = new Material();
material.SetTexture(TextureUnit.Diffuse, texture);
material.SetTechnique(0, CoreAssets.Techniques.Diff, 0, 0);
plane.SetMaterial(material);
try
{
await _plotNode.RunActionsAsync(new EaseBackOut(new RotateBy(2f, 0, 360, 0)));
}
catch (OperationCanceledException) { }
}
Please help!

Answer 1

To Create a material from a 2D Texture, you can use Material.FromImage .
Refer following documentation for more detail.
model.SetMaterial(Material.FromImage("earth.jpg"));
https://developer.xamarin.com/api/type/Urho.Material/
https://developer.xamarin.com/api/member/Urho.Material.FromImage/p/System.String/
private async void CreateScene()
{
_scene = new Scene();
_octree = _scene.CreateComponent<Octree>();
_plotNode = _scene.CreateChild();
var baseNode = _plotNode.CreateChild().CreateChild();
var plane = _plotNode.CreateComponent<StaticModel>();
plane.Model = CoreAssets.Models.Sphere;
plane.SetMaterial(Material.FromImage("earth.jpg"));
var cameraNode = _scene.CreateChild();
_camera = cameraNode.CreateComponent<Camera>();
cameraNode.Position = new Vector3(10, 15, 10) / 1.75f;
cameraNode.Rotation = new Quaternion(-0.121f, 0.878f, -0.305f, -0.35f);
Node lightNode = cameraNode.CreateChild();
var light = lightNode.CreateComponent<Light>();
light.LightType = LightType.Point;
light.Range = 100;
light.Brightness = 1.3f;
int size = 3;
baseNode.Scale = new Vector3(size * 1.5f, 1, size * 1.5f);
Renderer.SetViewport(0, new Viewport(_scene, _camera, null));
try
{
await _plotNode.RunActionsAsync(new EaseBackOut(new RotateBy(2f, 0, 360, 0)));
}
catch (OperationCanceledException) { }
}