CODEWITHSUNDEEP
wpfxaml3dcamera
MC9000
MC9000

Reputation: 2403

WPF 3D Camera confusion

I am working on a flooring visualizer (for a tile floor in perspective) and am going bonkers over the camera. Basically, I have a 2D rectangle (on the X & Y axis) and I want to look at the square as if it were a floor (which I'll "tile" later - similar to a checkerboard). The problem is, after spending hours fiddling with the LookDirection and Position (in the perspective camera), I can't seem to get it to look straight at the square (as if looking into the room). Nothing I change allows me to look at the scene "head on" (with either the X or Y axis in the "back") and it's always stuck at an angle. I don't want to rotate the model, only the camera. How do I do this?

        <Viewport3D>
        <Viewport3D.Camera>
            <PerspectiveCamera Position="-40,60,50" LookDirection="0.8,-.7,-0.8"  UpDirection="0,0,1" />
        </Viewport3D.Camera>
        <ModelVisual3D>
            <ModelVisual3D.Content>
                <Model3DGroup>
                    <DirectionalLight Color="White" Direction="-1,-1,-3" />
                    <GeometryModel3D>
                        <GeometryModel3D.Geometry>
                            <MeshGeometry3D Positions="0,0,0 25,0,0 25,25,0 0,25,0 " TriangleIndices="0 1 3 1 2 3  "/>
                        </GeometryModel3D.Geometry>
                        <GeometryModel3D.Material>
                            <DiffuseMaterial Brush="Red"/>
                        </GeometryModel3D.Material>
                    </GeometryModel3D>
                </Model3DGroup>
            </ModelVisual3D.Content>
        </ModelVisual3D>
    </Viewport3D>

Upvotes: 0

Views: 2216

Answers (1)

Jason Tyler
Jason Tyler

Reputation: 1389

I believe you're stuck at an angle because of your LookDirection. This is a direction vector, so having X, Y, and Z set is going to give you that offset look. You're pointing off into space at an angle rather than straight ahead. To look straight ahead, set X to 0 in your LookDirection and instead move the camera's Position X to the center of your scene, which is 12.5 (because your square goes from 0 to 25).

<PerspectiveCamera Position="12.5,60,50" LookDirection="0,-.7,-0.8"  UpDirection="0,0,1" />

That will produce a "head on" view. Based on what you said, it seemed like you wanted to be closer to the "floor", so I moved the Position closer to the "floor" and reduced the angle on the LookDirection vector, like so.

<PerspectiveCamera Position="12.5,50,20" LookDirection="0,-.7,-0.35"  UpDirection="0,0,1" />

This produced the following. enter image description here

Upvotes: 2

Related Questions