UnityObjectToClipPos()

[Alex-Tsurcan]

What does function UnityObjectToClipPos() ???

[bgolus]

CGIncludes\UnityCG.cginc line #153 from the 5.4 beta built in shader source

// Tranforms position from object to homogenous space
inline float4 UnityObjectToClipPos( in float3 pos )
{
#if defined(UNITY_SINGLE_PASS_STEREO) || defined(UNITY_USE_CONCATENATED_MATRICES)
    // More efficient than computing M*VP matrix product
    return mul(UNITY_MATRIX_VP, mul(unity_ObjectToWorld, float4(pos, 1.0)));
#else
    return mul(UNITY_MATRIX_MVP, float4(pos, 1.0));
#endif
}

[v037]

this is not helping much

[halley]

Basically it converts a coordinate vector from object space to clip space.

LearnOpenGL - Coordinate Systems

Local [or Object] Space:
Local space is the coordinate space that is local to your object, i.e. where your object begins in. Imagine that you’ve created your cube in a modeling software package (like Blender). The origin of your cube is probably at (0,0,0) even though your cube may end up at a different location in your final application. Probably all the models you’ve created all have (0,0,0) as their initial position. All the vertices of your model are therefore in local space: they are all local to your object.

…

Clip Space:
At the end of each vertex shader run, OpenGL expects the coordinates to be within a specific range and any coordinate that falls outside this range is clipped. Coordinates that are clipped are discarded, so the remaining coordinates will end up as fragments visible on your screen.

Clip Space is kinda like Screen Space, but can be different if you have a different viewport set up. Anything outside -1 ~ +1 is clipped.