> Added a SpotLight only to the D3D pipeline currently. > > ### API discussion points > > - [X] Added `SpotLight` as a subclass of `LightBase`. However, it could also > be a subclass of `PointLight` as it's a point light with direction and extra > factors. I saw that `scenario.effect.light.SpotLight` extends its respective > `PointLight`, but it's not a perfect analogy. In the end, I think it's a > questions of whether `PointLight` will be expanded in a way which doesn't not > suit `SpotLight`, and I tend to think that the answer is no. > > - [X] The inner and outer angles are the "diameter angles" as shown > [here](https://docs.microsoft.com/en-us/windows/win32/direct3d9/light-typeshttps://docs.microsoft.com/en-us/windows/win32/direct3d9/light-types). > I, personally, find it more intuitive that these are the "radius angles", > so half these angles, as used in the spotlight factor formula. Do you think I > can change this or do you prefer the current definition of the angles? > > - [ ] The current implementation uses an ad-hoc direction property (using a > `Point3D`). It crossed my mind that we could use the rotation transforms of > the node to control the direction instead, just like we use the > translation/layout of the node to get the position (there is an internal > Affine3D transform for lights, not sure why `AmbientLight` needs it). > Wouldn't that make more sense? When I rotate the light I would expect to see > a change in direction. > > ### Implementation discussion points > > - [ ] I've gotten advice from a graphics engineer to treat point lights as > spot lights with a 360 degrees coverage, which simplifies a few places. We > can still try to optimize for a point light by looking at the light > parameters: `falloff = 0` and `outerAngle = 180`. These possible optimization > exist in `ES2PhongShader.java` and `D3DMeshView.cc`, and in the > pixel/fragment shaders in the form of 3 different ways to compute the > spotlight factor (the `computeLightN` methods). We need to check which of > these give the best results. > > ### Performance > > Testing 3 point lights in order to compare with the [pre-patch > performance](https://github.com/openjdk/jfx/pull/43#issuecomment-600632114): > > Without the `falloff != 0` branching: > sphere 1000 subdivisions: 120 > mesh 5000: 9.5 > mesh 200: 111.5 > > With the `falloff != 0` branching: > sphere 1000 subdivisions: 120 > mesh 5000: 9.3 > mesh 200: 112.5 > > Ubuntu 20: > With the patch: > Mesh 200: 60 fps > Mesh 5000: 15 fps > Sphere 1000: 60 fps > > Without the patch (master branch) > Mesh 200: 60 fps > Mesh 5000: 16.3 fps > Sphere 1000: 60 fps > > So no major changes. I will repeat these tests to make sure there was no > mistake.
Nir Lisker has updated the pull request incrementally with two additional commits since the last revision: - Merge remote-tracking branch 'nlisker/8234920_Add_SpotLight_to_the_selection_of_3D_light_types' into 8234920_Add_SpotLight_to_the_selection_of_3D_light_types - Addressed review comments ------------- Changes: - all: https://git.openjdk.java.net/jfx/pull/334/files - new: https://git.openjdk.java.net/jfx/pull/334/files/e699127d..db109b28 Webrevs: - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=334&range=07 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=334&range=06-07 Stats: 31 lines in 4 files changed: 20 ins; 0 del; 11 mod Patch: https://git.openjdk.java.net/jfx/pull/334.diff Fetch: git fetch https://git.openjdk.java.net/jfx pull/334/head:pull/334 PR: https://git.openjdk.java.net/jfx/pull/334
