Archive 17/01/2023.

SetShaderParameterAnimation use

I3DB

In the UrhoSharp.SharpReality sample Advanced Earth, the shader is misplaced from the others using the Update call. https://github.com/xamarin/urho-samples/blob/b72d055a424d0e6be825c0239683c225d29ee723/HoloLens/02_HelloWorldAdvanced/Program.cs#L85

Just below that line, there is a code comment that the same could be done using SetShaderParameterAnimation.

How is this routine used? Any sample code available showing use?

Sinoid

You create a ValueAnimation and then pass that into Material::SetShaderParameterAnimation, you’ll need to look up how UrhoSharp has that bound to C#.

I3DB

Are there any C++ code samples, for either? ValueAnimation or SetShaderParameterAnimation.

Going from C++ to C# is much easier than starting with nothing in C#.

A bit of sample code goes a long way.

I3DB

github.com

xamarin/urho-samples/blob/b72d055a424d0e6be825c0239683c225d29ee723/FeatureSamples/Core/31_MaterialAnimation/MaterialAnimation.cs#L105


			light.LightType = LightType.Directional;


			// Create more StaticModel objects to the scene, randomly positioned, rotated and scaled. For rotation, we construct a
			// quaternion from Euler angles where the Y angle (rotation about the Y axis) is randomized. The mushroom model contains
			// LOD levels, so the StaticModel component will automatically select the LOD level according to the view distance (you'll
			// see the model get simpler as it moves further away). Finally, rendering a large number of the same object with the
			// same material allows instancing to be used, if the GPU supports it. This reduces the amount of CPU work in rendering the
			// scene.
			Material mushroomMat = cache.GetMaterial("Materials/Mushroom.xml");
			// Apply shader parameter animation to material
			ValueAnimation specColorAnimation=new ValueAnimation();


			specColorAnimation.SetKeyFrame(0.0f, new Color(0.1f, 0.1f, 0.1f, 16.0f));
			specColorAnimation.SetKeyFrame(1.0f, new Color(1.0f, 0.0f, 0.0f, 2.0f));
			specColorAnimation.SetKeyFrame(2.0f, new Color(1.0f, 1.0f, 0.0f, 2.0f));
			specColorAnimation.SetKeyFrame(3.0f, new Color(0.1f, 0.1f, 0.1f, 16.0f));
			// Optionally associate material with scene to make sure shader parameter animation respects scene time scale
			mushroomMat.Scene=scene;
			mushroomMat.SetShaderParameterAnimation("MatSpecColor", specColorAnimation, WrapMode.Loop, 1.0f);


			const uint numObjects = 200;

Sinoid

Yeah you found it. That’s nice that the UrhoSharp folks ported all of the examples - didn’t know they did that.