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Morphing

Description

This chapter briefly describes the morphing technique supported by Candera.

Chapters

See also:

    Morphing Mesh in SceneComposer User Manual

    Example Solutions

    Refer to following solutions in folder cgi_studio_player/content/Tutorials/08_SpecialRenderTechniques/0801_Special3DRenderTechniques

      MorphSolution MultiMorphing_MultiMorphShader MultiMorphing_AnimationGroup

       

       

      Introduction 

      Morphing

      Morphing means transforming the 3D geometry of an object smoothly from one shape into another.

      Morphing itself (smooth interpolation between vertices) is done in a shader (not on the CPU).

      drawing-4-1677221269.png
      What you need for Morphing

      Suitable content: "Morph targets" are different geometric states of the same object. The input vertices must correspond one-to-one between morph targets. This means, to morph between two shapes, you need two VertexBuffer with exactly the same number of vertices.

      An instance of MorphingMesh: This is a Mesh that stores

        the spliced vertex buffer created from the vertex buffers to be morphed (see MorphingMesh::CreateSplicedVertexBuffer) weight values for each of the shapes, which are activated as shader uniforms at render time (see MorphingMesh::SetMorphWeight) The appearance of the MorphingMesh must define a suitable morphing shader, which matches the number of shapes to be morphed (see RefTransLight1Morph vertex shader for morphing two shapes)

        Dynamics: Morphing is about change, so an application will have to set some morphing parameters (often depending on time). Use Animation::AllMorphWeightsPropertySetter to animation all the weight values of the MorphingMesh.

         

         


        Morphing Examples 

        Morphing between 2 Morph Items

        In below example solution, the reference shader RefTransLight1Morph_RefColor is used to morph between two morph items, by default having weight value 1,00 on the logo.

          MorphSolution from folder cgi_studio_player/content/Tutorials/08_SpecialRenderTechniques/0801_Special3DRenderTechniques
          drawing-4-1677221366.png

          The animation part of this solution animates both weight values and also adds a rotation animation.

          Morphing between Multiple Shapes using Shader

          Since a MorphingMesh is capable of handling up to 8 different vertex buffers, a special morphing shader must be used for more than 2 shapes. A morphing shader handling 5 shapes is used in the example below:

            MultiMorphing_MultiMorphShader from folder cgi_studio_player/content/Tutorials/08_SpecialRenderTechniques/0801_Special3DRenderTechniques
            drawing-4-1677221435.png
            Morphing between Multiple Shapes using AnimationGroup

            As an alternative to using a multi morph shader, multi-step morphing can also be realized by using an AnimationGroup, chaining separate morphing animations for each morphing shape pair. This approach is useful in case a specific target shader compiler has some restrictions regarding the maximum number of shader parameters.

              MultiMorphing_AnimationGroup from folder cgi_studio_player/content/Tutorials/08_SpecialRenderTechniques/0801_Special3DRenderTechniques

               

               

               

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