How to calculate clip space to World Space?
You could pass in an inverse view projection matrix, but the depth is in window coordinate space. A common trick is to calculate the world space view direction to the vertices with a view depth of 1 unit and then multiply that interpolated vector by the linearized depth value.
How to clip space to world space in a vertex shader?
// directx and metal requires Y-axis flip and use (0,1) as origin It would appear that Keijiro’s solution is wrong in some way. Might be a simple issue of it being wrong on some platforms but not others, or he just didn’t test it well enough.
Is there an inverse projection matrix in Unity?
This also means that though Unity provides the inverse view matrix and inverse camera projection matrix, they do not provide an inverse matrix for the projection matrix used to calculate the final clip space position.
Is the cameratoworldmatrix the inverse VP matrix?
The cameraToWorldMatrix isn’t the inverse VP matrix. It is only the inverse view matrix. But you are correct that the shader does not automatically have access to the inverse VP matrix and it is most easily accessed via script. 2. No, as mentioned above it’s the view matrix.
You could pass in an inverse view projection matrix, but the depth is in window coordinate space. A common trick is to calculate the world space view direction to the vertices with a view depth of 1 unit and then multiply that interpolated vector by the linearized depth value.
How are model coordinates converted to clip space?
Normally model data is used that is in some arbitrary coordinate system, and is then transformed using a matrix, converting the model coordinates into the clip space coordinate system. For this example, it’s easiest to illustrate how clip space works by using model coordinate values ranging from (-1,-1,-1) to (1,1,1).
What happens to data outside of clip space?
Any data which extends outside of the clip space is clipped off and not rendered. However, if a triangle straddles the border of this space then it is chopped up into new triangles, and only the parts of the new triangles that are in clip space are kept. The above graphic is a visualization of the clip space that all of the points must fit into.
// directx and metal requires Y-axis flip and use (0,1) as origin It would appear that Keijiro’s solution is wrong in some way. Might be a simple issue of it being wrong on some platforms but not others, or he just didn’t test it well enough.