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Fix VP2 rendering of UsdPreviewSurface with opacityThreshold #3947

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Merged
merged 8 commits into from
Oct 22, 2024
Merged

Fix VP2 rendering of UsdPreviewSurface with opacityThreshold #3947

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3a29045
Fix opacityThreshold was not exposed as a property in the UsdPreviewS…
jufrantz Oct 4, 2024
7fd21a5
Fix UsdPreviewSurface should be fully opaque when the input opacity i…
jufrantz Oct 4, 2024
43d61cc
Test UsdPreviewSurface opacityThreshold cut-outs.
jufrantz Oct 4, 2024
2319620
Updated baseline images for testVP2RenderDelegateDrawModes to reflect…
jufrantz Oct 9, 2024
02c65c1
Fix testVP2RenderDelegateUSDPreviewSurface for maya 2022 (ufe v2).
jufrantz Oct 9, 2024
5bc1a66
Merge branch 'dev' into fix_preview_surface_opacity_threshold
jufrantz Oct 11, 2024
1ca8787
Skip testOpacityThreshold with Maya light API v1.
jufrantz Oct 14, 2024
661ea9d
UsdPreviewSurface shading nodes with opacityThreshold are now VP2 ren…
jufrantz Oct 14, 2024
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58 changes: 36 additions & 22 deletions lib/usd/pxrUsdPreviewSurface/usdPreviewSurface.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -393,6 +393,8 @@ MStatus PxrMayaUsdPreviewSurface::initialize()

status = attributeAffects(opacityAttr, outTransparencyOnAttr);
CHECK_MSTATUS_AND_RETURN_IT(status);
status = attributeAffects(opacityThresholdAttr, outTransparencyOnAttr);
CHECK_MSTATUS_AND_RETURN_IT(status);

return status;
}
Expand Down Expand Up @@ -461,32 +463,44 @@ MStatus PxrMayaUsdPreviewSurface::compute(const MPlug& plug, MDataBlock& dataBlo
// details. We don't use the user-visible "outTransparency" attribute for transparency test
// because its value depends on upstream nodes and thus error-prone when the "opacity" plug
// is connected to certain textures. In that case, we should enable transparency.
bool opacityConnected = false;

const MObject opacityAttr
= depNodeFn.attribute(PxrMayaUsdPreviewSurfaceTokens->OpacityAttrName.GetText());
const MPlug opacityPlug(thisMObject(), opacityAttr);
if (opacityPlug.isConnected()) {
const MPlug sourcePlug = opacityPlug.source(&status);
CHECK_MSTATUS(status);
const MObject sourceNode = sourcePlug.node(&status);
CHECK_MSTATUS(status);

// Anim curve output will be evaluated to determine if transparency should be enabled.
if (!sourceNode.hasFn(MFn::kAnimCurve)) {
opacityConnected = true;
}
}
MObject opacityThresholdAttr = depNodeFn.attribute(
PxrMayaUsdPreviewSurfaceTokens->OpacityThresholdAttrName.GetText());
const MDataHandle opacityThresholdData
= dataBlock.inputValue(opacityThresholdAttr, &status);
CHECK_MSTATUS(status);

float transparencyOn = false;
if (opacityConnected) {
transparencyOn = true;
} else {
const MDataHandle opacityData = dataBlock.inputValue(opacityAttr, &status);
CHECK_MSTATUS(status);
const float opacity = opacityData.asFloat();
if (opacity < 1.0f - std::numeric_limits<float>::epsilon()) {

// For masked transparency, we want VP2 to treat the shader as opaque.
if (opacityThresholdData.asFloat() <= 0.0f) {
bool opacityConnected = false;

const MObject opacityAttr
= depNodeFn.attribute(PxrMayaUsdPreviewSurfaceTokens->OpacityAttrName.GetText());
const MPlug opacityPlug(thisMObject(), opacityAttr);
if (opacityPlug.isConnected()) {
const MPlug sourcePlug = opacityPlug.source(&status);
CHECK_MSTATUS(status);
const MObject sourceNode = sourcePlug.node(&status);
CHECK_MSTATUS(status);

// Anim curve output will be evaluated to determine if transparency should be
// enabled.
if (!sourceNode.hasFn(MFn::kAnimCurve)) {
opacityConnected = true;
}
}

if (opacityConnected) {
transparencyOn = true;
} else {
const MDataHandle opacityData = dataBlock.inputValue(opacityAttr, &status);
CHECK_MSTATUS(status);
const float opacity = opacityData.asFloat();
if (opacity < 1.0f - std::numeric_limits<float>::epsilon()) {
transparencyOn = true;
}
}
}

Expand Down
3 changes: 3 additions & 0 deletions test/lib/mayaUsd/render/vp2RenderDelegate/testVP2RenderDelegateUSDPreviewSurface.py
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,8 @@
# limitations under the License.
#

import unittest

import fixturesUtils
import imageUtils

Expand Down Expand Up @@ -271,6 +273,7 @@ def testDoubleSided(self):
mayaUtils.setBasicCamera(3)
self.assertSnapshotClose('doubleSided_disabled_back.png')

@unittest.skipUnless(int(os.getenv("MAYA_LIGHTAPI_VERSION")) >= 2, 'UsdPreviewSurface fragment graph for light API v1 does not support opacityThreshold')
def testOpacityThreshold(self):
'''
Test UsdPreviewSurface transparency cut-out. The surface fragments should be
Expand Down
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