当3D对象接近屏幕时反转比例

问题描述

我正在尝试制作一个3D对象(以前从未从2D位置投影过),以根据其靠近屏幕的Z位置进行缩放。非投影使对象遵循线性路径,并且模糊到x,y和z位置,从而使其看起来像“标尺”,没有该标尺,因此在给定此输入的情况下

            var ctx = new ModelDrawContext(_lookAtMatrix);
            
            int windowWidth = 1920;
            int windowHeight = 1080;


            Vector4 screenPos = camera.projectionMatrix * camera.modelViewMatrix * new Vector4(Position.X,Position.Y,Position.Z,1);
            screenPos.X /= screenPos.W;
            screenPos.Y /= screenPos.W;
            screenPos.Z /= screenPos.W;
            int dx = (int)(windowWidth * (screenPos.X + 1) / 2);
            int dy = (int)(windowHeight - windowHeight * (screenPos.Y + 1) / 2);
            double dz = (1 - 1 * (screenPos.Z + 1) / 2.0);

            var identity = Matrix4.Identity;

            var Viewport = new Viewport(new Rectanglei(0,1920,1080));
            var unprojected = Viewport.Unproject(new Vector3(dx,dy,0.01f),ctx.Projection.ToRaw(),ctx.View.ToRaw(),identity);

            var coords3D = unprojected;
            var modelTranslationMatrix = 
                System.Numerics.Matrix4x4.CreateTranslation((float)coords3D.X,(float)coords3D.Y,(float)coords3D.Z);

            var sum = System.Numerics.Matrix4x4.CreateScale(0.008f) * System.Numerics.Matrix4x4.CreateRotationZ(0) * modelTranslationMatrix;
            

            ctx.DrawModelInstance(_object,sum);

如何反转比例尺?当物体接近屏幕时,它会从大到小缩放,应该相反。

谢谢!

解决方法

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