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The same material and the same setting parameters result in different display effects between perspective projection and orthographic projection.
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Describe the bug A clear and concise description of what the bug is. The same material and the same setting parameters result in different display effects between perspective projection and orthographic projection.
To Reproduce Set perspective projection：
val height = view.viewport.height
val aspect = width.toDouble() / height.toDouble()
camera.setLensProjection(
cameraFocalLength.toDouble(),
aspect,
cameraNear.toDouble(),
cameraFar.toDouble())
Set up orthographic projection：
val width = view.viewport.width
val height = view.viewport.height
val aspect = width.toDouble() / height.toDouble()
val scale = 2.0
val left = -scale * aspect
val right = scale * aspect
val bottom = -scale
val top = scale
val near = cameraNear.toDouble()
val far = cameraFar.toDouble()
camera.setProjection(
Camera.Projection.ORTHO,
left,
right,
bottom,
top,
near,
far
)
Set material parameters：
setParameter("ior", 1.517f)
setParameter("roughness", 0.38f)
setParameter("transmission", 1f)
setParameter("reflectance", 0.0f)
material.mat:
material {
name : TransparentMaterial,
requires : [
uv0
],
shadingModel : lit,
refractionMode : screenspace, // Choose a refraction mode: none, cubemap, or screenspace
refractionType : thin, // Choose refraction type: solid or thin
depthWrite : true, // Changed to true to properly handle depth for refractive materials
parameters : [
{
type : "float3",
name : "baseColor"
},
{
type : "float",
name : "roughness"
},
{
type : "float",
name : "ior"
}
,
{
type : "float",
name : "transmission"
},
{
type : float,
name : reflectance
}
,
{
type : float,
name : microThickness
}
],
}
fragment {
void material(inout MaterialInputs material) {
prepareMaterial(material);
material.metallic = 0.0;
material.baseColor.rgb = materialParams.baseColor;
material.roughness = materialParams.roughness;
material.ior = materialParams.ior;
material.transmission = materialParams.transmission;
material.reflectance = materialParams.reflectance;
material.microThickness = materialParams.microThickness;
}
}
Expected behavior The display effect of orthogonal projection is the same as that of perspective projection.
Screenshots
https://github.com/google/filament/assets/6195253/ee60cd2c-2e22-453d-883c-565f77e20e93
https://github.com/google/filament/assets/6195253/0abadbe3-95c4-4726-9288-996f7caa26c0
Smartphone (please complete the following information):
- Device: OnePlus 9 5G
- OS: Android13
- filament version 1.49.2
Looks like a problem with refraction
The material becomes 100% transparent under orthogonal projection, as if it turned into air. How should I set the refraction?
