water reflection

General Discussion
1

Is water reflection something done only with shaders? I just want to make a reflection of my sky on a flat water plane. I only know about cubemaps when it comes to reflection, but I dont think thats of any use in this case.

2

I’ve done shaderless water a long time ago. This code may help:

cm = CardMaker("water")
cm.setFrame(-1, 1, -1, 1)
self.water = render.attachNewNode(cm.generate())
self.water.setScale(4096)
self.water.lookAt(0, 0, -1)
self.water.setZ(62.365)
self.water.setShaderOff(1)
self.water.setLightOff(1)
self.water.setAlphaScale(0.5)
self.water.setTransparency(TransparencyAttrib.MAlpha)
wbuffer = base.win.makeTextureBuffer("water", 512, 512)
wbuffer.setClearColorActive(True)
wbuffer.setClearColor(base.win.getClearColor())
self.wcamera = base.makeCamera(wbuffer)
self.wcamera.reparentTo(render)
self.wcamera.node().setLens(base.camLens)
self.wcamera.node().setCameraMask(BitMask32.bit(1))
self.water.hide(BitMask32.bit(1))
fir.hide(BitMask32.bit(1))
wtexture = wbuffer.getTexture()
wtexture.setWrapU(Texture.WMClamp)
wtexture.setWrapV(Texture.WMClamp)
wtexture.setMinfilter(Texture.FTLinearMipmapLinear)
self.wplane = Plane(Vec3(0, 0, 1), Point3(0, 0, self.water.getZ()))
wplanenp = render.attachNewNode(PlaneNode("water", self.wplane))
tmpnp = NodePath("StateInitializer")
tmpnp.setClipPlane(wplanenp)
tmpnp.setAttrib(CullFaceAttrib.makeReverse())
self.wcamera.node().setInitialState(tmpnp.getState())
self.water.projectTexture(TextureStage("reflection"), wtexture, self.wcamera)
#base.bufferViewer.toggleEnable()
3

Well Im glad there is a way.

Though it doesn’t work for me. I commented the line “fir.hide(BitMask32.bit(1))” and changed the Config.prc file by adding “framebuffer-stencil #t” and changing “stencil-bits 1” but the buffer viewer is blank and I dont see anything.

4

Well, you still need to adjust the water camera to be flipped over the plane, using something like this:

        taskMgr.add(self.update_camera, 'update-water', sort=45)

    def update_camera(self, task):
        mat = base.cam.getMat(self.wplanenp)
        mat *= self.wplane.getReflectionMat()
        self.wcamera.setMat(mat)
        return task.cont

I’m not sure why you’re messing with your stencil buffer. Reflections have nothing to do with the stencil buffer.

5

Either the posting dates are wrong for me or this is the second post that resurrects years-old threads. :stuck_out_tongue: