Comments (2)
Because Tungsten is a raytracer, it does not use a projection matrix internally and does not have a far/near plane per se. There is a de-facto near and far plane that are imposed by floating point precision, which are effectively 1e-4f for near and 1e30f for far, although those are not values you would want to use in a projection matrix :)
The values in PreviewWindow.hpp are only for the real-time preview inside the editor and are not used for actual rendering.
The depth buffers output by Tungsten are linear-depth (distance from the camera - not Z!), so there is no need to transform the values as you would in a hardware depth buffer.
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Because Tungsten is a raytracer, it does not use a projection matrix internally and does not have a far/near plane per se. There is a de-facto near and far plane that are imposed by floating point precision, which are effectively 1e-4f for near and 1e30f for far, although those are not values you would want to use in a projection matrix :)
The values in PreviewWindow.hpp are only for the real-time preview inside the editor and are not used for actual rendering.The depth buffers output by Tungsten are linear-depth (distance from the camera - not Z!), so there is no need to transform the values as you would in a hardware depth buffer.
Thanks. I kind of mixed up rasterization and ray tracing.
I noticed that there is a transform matrix inside tungsten:
float t = 1.0f/std::tan(Angle::degToRad(fov)*0.5f);
float a = (far + near)/(far - near);
float b = 2.0f*far*near/(far - near);
float c = t/ratio;
return Mat4f(
c, 0.0f, 0.0f, 0.0f,
0.0f, t, 0.0f, 0.0f,
0.0f, 0.0f, a, -b,
0.0f, 0.0f, 1.0f, 0.0f
Tungsten uses it to multiply (u, v, cot(θ/2)) to decide a primitive ray's direction. So I reverse this process to get UV coordinates of world space coordinates. This time I successfully finished my 'reprojection' task.
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Related Issues (20)
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- fixed
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- build error core.lib HOT 2
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- Example scene with .vdb file HOT 2
- Far slower than the binary version HOT 1
- Debug/core.lib HOT 1
- About “seed” parameter in script tungsten.exe HOT 2
- About render elments . HOT 1
- Editor randomly crashes on macOS HOT 2
- Cannot Compile Master on Windows
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