Creation of PxHeightField Geometry

[im-esteban]

Hi there Mr. fabmax, again thanks for always answering my small issues and helping everyone out, even my whole game idea is reliant on your library to a very high degree, anyways, the issue that brought me here once more is that there are some things i see missing, like this: github.com/fabmax/physx-jni/issues/74

Here you are telling someone that they should use PxHeightFieldSample.SIZEOF,
so what do you think should be the answer for us in the JS side?

let heightFieldDesc = new PhysX.PxHeightFieldDesc()
heightFieldDesc.samples.stride = 12 //PxHeightFieldSample 8 bytes? 12 bytes?

i tried going through your physx-jni and kool-engine (such cool engine) and the only piece i'm missing is that one,
even tried setting the stride value from 5 to 52(there is no way it is more than 16) and testing every number generating a flat height map but every time the collisions weren't right which makes me think that there is something else wrong, i should have hit the size, right?

Truly yours, your biggest fan, this is Stan.

[im-esteban]

oh and real quick tell me if there is something wrong here, i tried to simplify it so you can take a quick look

let sampleArray = new PhysX.PxArray_PxHeightFieldSample()
let heightFieldDesc = new PhysX.PxHeightFieldDesc()
heightFieldDesc.nbColumns = numberOfColumns
heightFieldDesc.nbRows = numberOfRows
heightFieldDesc.format = PhysX.PxHeightFieldFormatEnum.eS16_TM
                                                                                
heightFieldDesc.samples.stride = 0 // placeholder, i have no idea

for (let i = 0; i < heights.length; i++) {

    let sample = new PhysX.PxHeightFieldSample()

    sample.height = heights[i]
    sampleArray.set(i, sample)
}

heightFieldDesc.samples.data = sampleArray

let hf = PhysX.PxTopLevelFunctions.prototype.CreateHeightField(heightFieldDesc)
let flags = new PhysX.PxMeshGeometryFlags(0)
geometry = new PhysX.PxHeightFieldGeometry(hf, flags, 1, 100, 100)

[im-esteban]

went through the whole deal of compiling PhysX, and building a program with it, the answer is 4, the thing is that still it doesn't work well for me, if i find out why i post an update

[im-esteban]

Fixed it, you have to call .begin() on the array (or .data() if is a vector) like this:
heightFieldDesc.samples.data = sampleArray.begin()

[fabmax]

Hi! Yeah 4 is correct. I haven't yet found a way how to get these values in a nice way in JS. I usually check what the SIZEOF value in the java version returns and simply use that. Here I did that in kool

The desc.samples.data = samples.begin() is there as well 😄

Anyway, glad you figgered it out!

[im-esteban]

I was pretty close, was zooming through those files too, also your code is very clear to read.

Good night and thank you, fabmax!